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Stage of stellar evolution
In the field of stellar evolution, a blue loop is a stage in the life of an evolved star where it changes from a cool star to a hotter one before cooling
Blue_loop
Brightest star in the constellation of Carina
Canopus is undergoing core helium burning and is currently in the so-called blue loop phase of its evolution, having already passed through the red-giant branch
Canopus
Hot, luminous star with a spectral type of A9 or earlier
execute a number of blue loops before either exploding as a type II supernova or finally dumping enough of its outer layers to become a blue supergiant again
Blue_supergiant
Creation of chemical elements within stars
execute a blue loop before reaching the asymptotic giant branch. Such a star initially moves away from the AGB toward bluer colours, then loops back again
Stellar_nucleosynthesis
Stars with a supergiant luminosity class with a spectral type of K or M
experience a blue loop, some can have several. Temperatures can reach 10,000K at the peak of the blue loop. The exact reasons for blue loops vary in different
Red_supergiant
Portion of the giant branch before helium ignition
a blue loop before returning to join the asymptotic giant branch. Stars only a little more massive than 2 M☉ perform a barely noticeable blue loop at
Red-giant_branch
Rare star with tremendous luminosity and high rates of mass loss by stellar winds
away. They may "bounce" backwards and forwards executing one or more "blue loops", still at a fairly steady luminosity, until they explode as a supernova
Hypergiant
Star that has a supergiant luminosity class, with a spectral type of F or G
undergo a blue loop, temporarily re-heating and becoming yellow or even blue supergiants before cooling again. Stellar models show that blue loops rely on
Yellow_supergiant
Grouping of evolved cool luminous stars
diagram. This is the horizontal branch (for population II stars) or a blue loop for stars more massive than about 2.3 M☉. After the completion of helium
Asymptotic_giant_branch
Clustering of stars in astronomy diagram
red-giant branch and perform a blue loop. For stars only a little more massive than the sun, around 2 M☉, the blue loop is very short and at a luminosity
Red_clump
Type of variable star
supergiants but may still execute a blue loop through the instability strip. The duration and even existence of blue loops is sensitive to the mass, metallicity
Classical_Cepheid_variable
Stage of stellar evolution
stars. They vary in temperature during core helium fusion and perform a blue loop before moving to the asymptotic giant branch. Stars more massive than
Horizontal_branch
Hypothetical class of star that develops from a red dwarf
A blue dwarf is a hypothetical class of star that develops from a red dwarf after it has exhausted much of its hydrogen fuel supply. Because red dwarfs
Blue_dwarf_(red-dwarf_stage)
Feature of the Hertzsprung-Russell diagram
Conversely, a star may re-enter the Hertzsprung gap after crossing it in a blue loop event. The location is roughly triangular, though ill-defined at the edges
Hertzsprung_gap
Segment of the Chicago "L"
The Loop (historically Union Loop) is the 1.79-mile-long (2.88 km) circuit of elevated rail that forms the hub of the Chicago "L" system in the United
The_Loop_(CTA)
Animated children's television series for PBS Kids
centers on Lyla Loops (a 7-year-old young Jamaican-American girl), her sidekick Stu (a fuzzy blue hyrax-like creature), and the rest of the Loops family. The
Lyla_in_the_Loop
Community area in Chicago, Illinois
The Loop is Chicago's central business district and one of the 77 municipally-designated community areas of Chicago in Illinois, United States. Located
Chicago_Loop
Type of star that is massive and luminous
Virginis variables such as W Virginis itself, stars that are executing a blue loop triggered by thermal pulsing. A very small number of Mira variables and
Supergiant
Hot, giant star of early spectral type
Giants Red giants Blue giants Bright giants Supergiants Red supergiant Hypergiants absolute magni- tude (MV) In astronomy, a blue giant is a hot star
Blue_giant
2012 film by Rian Johnson
Segan as Kid Blue Piper Perabo as Suzie Summer Qing as Old Joe's wife Jeff Daniels as Abe Pierce Gagnon as Cid Garret Dillahunt as Jesse Looper was written
Looper_(film)
Astronomical category of stars
Binary stars with highly variable emission and stellar spectral type Fe a blue supergiant with a forest of forbidden FeII lines in its spectrum. The term
Iron_star
Star of relatively small size and low luminosity
main-sequence stars. Blue (type O and type B) main sequence stars are so large that they are difficult to distinguish from blue giant stars, either in
Dwarf_star
Bus transit system in State College, PA
The three current routes, Blue/White Loops and Red Link, run during the fall and spring semesters. Only Blue Loop and White Loop run on the summer and operate
Centre Area Transportation Authority
Centre_Area_Transportation_Authority
Main sequence star that is more luminous and bluer than expected
A blue straggler is a type of star that is more luminous and bluer than expected. Typically identified in a stellar cluster, they have a higher effective
Blue_straggler
Brightest star in the constellation Lepus
contracting and heating up in the latter phases of stellar evolution, in a blue loop. USS Arneb (AKA-56) was a ship of the United States Navy. van Leeuwen
Alpha_Leporis
Binary star in the constellation Scorpius
initial mass of 15 to 16 M☉, or the possibility that Antares is on a blue loop with an initial mass of 13 M☉ (while excluding 14 M☉ as a possible mass
Antares
Type of star larger than main-sequence but smaller than a giant
called the first crossing since they may cross the strip again later on a blue loop. In the 2 – 3 M☉ range, this includes Delta Scuti variables such as β
Subgiant
Star in the constellation Lacerta
with a projected rotational velocity of 28 km/s. It is believed to be a blue loop star that has already spent time as a red supergiant after fusing the
4_Lacertae
Visualization of variable interrelationships
link, represented by the bottom blue arrow. The causal effect between these variables forms a positive reinforcing loop, represented by the green arrow
Causal_loop_diagram
Australia and Vekoma's Blue Hawk at Six Flags Over Georgia. A Finnish loop consists of a twisted dive followed by a vertical loop. It was first used by
List of roller coaster elements
List_of_roller_coaster_elements
Stellar classification
outer layers and become hotter again, sometimes going through a number of blue loops before finally reaching the Wolf–Rayet stage. The more-massive stars,
O-type_star
Stellar classification distinguished by bright blue luminosity
Red dwarfs Subdwarfs Main sequence ("dwarfs") Subgiants Giants Red giants Blue giants Bright giants Supergiants Red supergiant Hypergiants absolute magni-
B-type_main-sequence_star
Binary star system in the constellation Leo
parsecs from Earth, or 1,270 light years away. It is believed to be in a blue loop phase. Eta Leonis is apparently a multiple star system, but the number
Eta_Leonis
Dim, low mass stars on the main sequence
type for trillions of years, until its fuel is depleted and it turns into a blue dwarf. Because of the comparatively short age of the universe, no red dwarfs
Red_dwarf
State highway loops in Texas are owned and maintained by the Texas Department of Transportation (TxDOT). Loop 105 is the old route of US 87 through Thomaston
List of state highway loops in Texas (100–199)
List_of_state_highway_loops_in_Texas_(100–199)
Programming idiom
In computer programming, an infinite loop (or endless loop) is a sequence of instructions that, as written, will continue endlessly, unless an external
Infinite_loop
Changes to stars over their lifespans
Lyrae variables), whereas some become even hotter and can form a blue tail or blue hook to the horizontal branch. The morphology of the horizontal branch
Stellar_evolution
5-mile footpath in Sheffield, England
Tinsley Canal towpath as a 8-mile (13 km) circular walk known as the Blue Loop. The walk links with the Upper Don Walk at Lady's Bridge. Map all coordinates
Five_Weirs_Walk
Classification of stars based on spectral properties
3345C. doi:10.1088/0004-6256/137/2/3345. ISSN 0004-6256. S2CID 15376964. Looper, Dagny L.; Kirkpatrick, J. Davy; Cutri, Roc M.; Barman, Travis; Burgasser
Stellar_classification
Large self-illuminated object in space
Coronal loops are arching magnetic field flux lines that rise from a star's surface into the star's outer atmosphere, its corona. The coronal loops can be
Star
Type of star that is luminous, blue, and variable in brightness
Luminous blue variables (LBVs) are rare, massive, evolved stars that show unpredictable and sometimes dramatic variations in their spectra and brightness
Luminous_blue_variable
hottest stars List of coolest stars List of Wolf-Rayet stars List of luminous blue variable stars List of O-type stars List of brown dwarfs List of white dwarfs
Lists_of_stars
Breakfast cereal made by WK Kellogg Co
Froot Loops in 1963. Originally, there were only red, orange and yellow loops; green, blue and purple loops were added during the 1990s, with blue being
Froot_Loops
Outer region of the volume of a star
""Beyond the Blue Horizon" – A Total Solar Eclipse Chase". 1999-08-05. Retrieved 2010-05-21. On ordinary days, the corona is hidden by the blue sky, since
Stellar_atmosphere
Brightness of a celestial object observed from the Earth
20th century and older orthochromatic (blue-sensitive) photographic film, the relative brightnesses of the blue supergiant Rigel and the red supergiant
Apparent_magnitude
Chicago "L" rapid transit line
and one immediately west of downtown.) The Blue Line also has two in-system transfers (both in the Loop), and does not share tracks with any other 'L'
Blue_Line_(CTA)
Continuous band of stars that appears on plots of stellar color versus brightness
Red dwarfs Subdwarfs Main sequence ("dwarfs") Subgiants Giants Red giants Blue giants Bright giants Supergiants Red supergiant Hypergiants absolute magni-
Main_sequence
Hypothetical astronomical object
In loop quantum gravity theory, a Planck star is a hypothetical astronomical object, theorized as a compact, exotic star, that exists within a black hole's
Planck_star
Toronto Transit Commission streetcar terminus
Exhibition Loop is the terminus for the 509 Harbourfront and 511 Bathurst streetcar routes, the 174 Ontario Place-Exhibition, and the 307 Blue Night Bathurst
Exhibition_Loop
full-time employees before being acquired in June 2013 by Cincinnati-based Blue Loop Capital. Other successful companies that have been a part of Ruta N's
Ruta_N
Star not gravitationally bound to any galaxy
Since then, several other anisotropies at other wavelengths – including blue and x-ray – have been detected with other space telescopes and they are now
Intergalactic_star
Class of massive star with a spectral type of A to K
supergiants may execute multiple "blue loops", shedding much of their atmosphere, but without actually ever reaching the blue supergiant stage, each one taking
Yellow_hypergiant
Stellar explosions that appear to be supernovae
Type V supernovae, Eta Carinae analogs, and giant eruptions of luminous blue variables (LBV). Supernova impostors appear as remarkably faint supernovae
Supernova_impostor
Main-sequence star of spectral type O
Red dwarfs Subdwarfs Main sequence ("dwarfs") Subgiants Giants Red giants Blue giants Bright giants Supergiants Red supergiant Hypergiants absolute magni-
O-type_main-sequence_star
Substellar object
Emily L.; Faherty, Jacqueline K.; Cruz, Kelle L.; Van Gordon, Mollie M.; Looper, Dagny L. (September 2015). "Fundamental Parameters and Spectral Energy
Brown_dwarf
Galaxy in the constellation Crater
categorized it as a satellite galaxy, because of the presence of a handful of blue loop stars and a sparsely populated red clump; the existence of some of these
Laevens_1
Rapid transit system in Chicago, Illinois
existing Blue Line subway at its north and south ends, making possible the "Blue Line loop", envisioned as an underground counterpart to the Loop elevated
Chicago_"L"
Type of star, larger and brighter than the Sun
Red dwarfs Subdwarfs Main sequence ("dwarfs") Subgiants Giants Red giants Blue giants Bright giants Supergiants Red supergiant Hypergiants absolute magni-
Giant_star
Wide-band photometric system used in astronomy
The UBV photometric system (from Ultraviolet, Blue, Visual), also called the Johnson system (or Johnson-Morgan system), is a photometric system usually
UBV_photometric_system
Layer of a star's atmosphere
these cool loops in detail from the observations taken with the EUV spectrometer on Skylab in 1976. When the plasma temperature of these loops becomes coronal
Chromosphere
Calculated property of a star or planet
standards—red M stars that radiate heavily in the infrared to the very hot blue O stars that radiate largely in the ultraviolet. Various colour-effective
Effective_temperature
Wisconsin recreational trail
five loops available for use. The Yellow Loop is one and a half miles (2.4 km) long. No pets are allowed on this loop. The Green and Blue Loops are both
Raven_Trail
Young stars of spectral types A and B
scattered from disk light relatively increases – it is the same effect as the blue color of our sky). Analogs of Herbig Ae/Be stars in the smaller mass range
Herbig_Ae/Be_star
Chicago "L" station
Jackson is an 'L' station on the CTA's Blue Line, located in the Loop. Like the rest of the Milwaukee-Dearborn subway (excluding Clinton), the station
Jackson station (CTA Blue Line)
Jackson_station_(CTA_Blue_Line)
adjacent to the loop. Overnight the 307 Bathurst Blue Night and 363 Ossington Blue Night buses use the loop as their southern terminus. The loop opened in 1996
Toronto streetcar system loops
Toronto_streetcar_system_loops
Blue star with strong helium lines
A helium star is a class O or B star (blue), which has extraordinarily strong helium lines and weaker than normal hydrogen lines, indicating strong stellar
Helium_star
American police procedural drama television series (2010–2024)
Out Blue Bloods". Looper. Archived from the original on November 6, 2023. Retrieved November 6, 2023. Ori, Jack (March 6, 2025). "The Secret to Blue Bloods'
Blue_Bloods
Star of luminosity class VI under the Yerkes spectral classification system
Red dwarfs Subdwarfs Main sequence ("dwarfs") Subgiants Giants Red giants Blue giants Bright giants Supergiants Red supergiant Hypergiants absolute magni-
Subdwarf
Cloth insignia worn on the shoulder of a uniform
shoulder loops worn on the shoulder straps to indicate the program level. Webelos Scouts wearing tan uniforms and all Cub Scout leaders wear blue loops, Boy
Shoulder_mark
Variable star in the constellation Leo
to hotter temperatures, being in the evolutionary stage known as the blue loop. This is an enormous star with about 20 times the Sun's mass (M☉) and
Rho_Leonis
Variable star in the constellation Carina
post-red supergiant star, either evolving towards a Wolf–Rayet star or on a blue loop before returning to a cooler temperature. Van Leeuwen, F. (2007). "Validation
HD_96919
Toxin found in black mambas
from most 3FTx proteins in having an elongated second loop and shortened first and third loops. Mambalgins have relatively low sequence similarity to
Mambalgins
Star in the constellation Centaurus
cooled so it lies at the blue edge of the Cepheid instability strip. It is expected to get no cooler and may perform a blue loop while slowly increasing
V810_Centauri
Magnetic field generated inside a star
creates starspots on the surface, and the related phenomenon of coronal loops. A star's magnetic field can be measured using the Zeeman effect. Normally
Stellar_magnetic_field
Variable star in the constellation Puppis
evolving towards cooler temperatures for the second time after performing a blue loop. The third crossing of the instability strip occurs much more slowly than
RS_Puppis
Japanese light novel series and its adaptations
7th Time Loop: The Villainess Enjoys a Carefree Life Married to Her Worst Enemy! is a Japanese light novel series written by Touko Amekawa. The series
7th_Time_Loop
American entrepreneur and musician
donating computers to local Colombian schools. Yuxi Pacific was acquired by Blue Loop Capital in June 2013 for an undisclosed amount of cash. Following the
Michael_Puscar
Coming together of two stars
With this new technology, astronomers discovered that some stars, known as blue stragglers, appeared younger than other stars in the cluster. Astronomers
Stellar_collision
The work loop technique is used in muscle physiology to evaluate the mechanical work and power output of skeletal or cardiac muscle contractions via in
Work_loop
American infrastructure and tunneling company
California. In 2021, TBC completed the Las Vegas Convention Center (LVCC) Loop, a three-station transportation system with 1.7 miles (2.7 km) of tunnels
The_Boring_Company
Novelty radio made by Panasonic Japan in the early 1970s
the radio was twisted open or closed. The Toot-a-Loop came in several colors including white, red, blue, and yellow. It was also produced in orange and
Panasonic_Toot-a-Loop_Radio
Launched roller coaster at Europa-Park
because the first loop on Dragon Khan at PortAventura Park reaches a height of 36 metres. The park has since clarified that Blue Fire's loop is the tallest
Blue_Fire
Bookkeeping survey of stars
temperature is usually shown using the letter codes O B A F G K M running from 'blue' (type O, actually bluish white) through white (type F) to 'red' (type M
Star_count
Winter sports resort in Auvergne-Rhône-Alpes, France
point offers a 1.5-kilometer green loop, a 5-kilometer blue loop, a 9-kilometer red loop, and a 17-kilometer black loop. At the resort, three trails (squirrel
Chalmazel_Ski_Resort
150-mile circular walk around London
London Loop became one of his key routes, along with its sister route, the Capital Ring. The route is divided into 24 sections in three groups: the "blue" group
London_Outer_Orbital_Path
Chicago "L" rapid transit line
South Loop, and then through the Dan Ryan Expressway median to 95th/Dan Ryan in the Roseland neighborhood on the South Side. Like Chicago's Blue Line and
Red_Line_(CTA)
Subdwarf star with spectral type B
subluminous blue stars around the north galactic pole. In the Palomar-Green survey, they were discovered to be the most common kind of faint blue star with
Subdwarf_B_star
Star in the constellation Cygnus
supergiant in a very short and final high mass loss state following a blue loop, before eventually exploding into a supernova or directly collapsing to
NML_Cygni
Scottish actor, producer, director, writer and presenter (born 1965)
received a Tony Award for Best Musical as a producer of the musical A Strange Loop. In 2025, Cumming was awarded a law doctorate by the University of St Andrews
Alan_Cumming
Method of forming fabric
interconnected loops, done by hand, machine or both. Knitting creates stitches: loops of yarn in a row. When done by hand, the loops are created with
Knitting
Chicago "L" rapid transit line
elevated and at grade tracks and serves the Southwest Side, running from the Loop to Midway International Airport. As of 2023, an average of 16,979 weekday
Orange_Line_(CTA)
Proposed system for launching objects into orbit
A launch loop, or Lofstrom loop, is a proposed system for launching objects into orbit using a moving cable-like system situated inside a sheath attached
Launch_loop
Star in the constellation Carina
the third time, cooling as it evolves towards a red supergiant after a blue loop. van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction",
HD_84810
2nd episode of the 1st season of Severance
"Half Loop" is the second episode of the American science fiction psychological thriller television series Severance. The episode was written by series
Half_Loop
Red giant star in the cluster M67
unlikely circumstances, it could smoothly ignite helium and become a blue loop star. After that, it will certainly enter the asymptotic giant branch
Sand_364
Astronomical diagram graphing two colour indices
Telescope used SLR in the measurement of redshifts of galaxy clusters. The blue-tip method is closely related to SLR, but was used mainly to correct Galactic
Color–color_diagram
Type of variable stars
branch (AGB), W Vir stars undergoing hydrogen or helium shell burning on a blue loop, and RV Tau stars being post-AGB objects at or near the end of nuclear
Type_II_Cepheid
Star whose brightness fluctuates, as seen from Earth
and supergiants.[citation needed] Luminous blue variables Also known as the S Doradus variables, luminous blue variables (LBV) are among the most luminous
Variable_star
Largest male sex organ in the animal kingdom
is fibroelastic like those of the blue whale's artiodactyl relatives. The retracted penis curves in an S-shaped loop and stays inside the body. When erect
Blue_whale_penis
1983 film by John Badham
Blue Thunder in a heavily armed Hughes 500 helicopter. After a tense battle, Murphy shoots Cochrane down, executing a 360° loop through use of Blue Thunder's
Blue_Thunder
BLUE LOOP
BLUE LOOP
Boy/Male
Tamil
Nilanjan | நீலாஂஜந
Blue, With blue eyes
Nilanjan | நீலாஂஜந
Boy/Male
Hindu
Blue, With blue eyes
Girl/Female
Tamil
Neelavathi | நீலாவாதீÂ
Blue
Neelavathi | நீலாவாதீÂ
Boy/Male
Tamil
Neelanjan | நீலஂஜந
Blue, With blue eyes
Neelanjan | நீலஂஜந
Female
Yiddish
(בְּלוּמֶע) Variant form of Yiddish Bluma, BLUME means "flower."
Girl/Female
Hindu
Blue
Boy/Male
Tamil
Blue
Boy/Male
Indian, Sanskrit
Blue Throated; Blue Necked
Boy/Male
Irish Gaelic
Blue.
Surname or Lastname
English
English : generally a fairly recent Americanized form of German Blau or the French cognate Bleu.
Boy/Male
Native American
Blue.
Boy/Male
Indian, Sanskrit
Blue Throated; Blue Necked
Boy/Male
Tamil
Blue
Boy/Male
Irish
Blue.
Boy/Male
Tamil
Blue
Boy/Male
Hindu, Indian, Sanskrit
Blue Throated; Blue Necked
Boy/Male
Gujarati, Hindu, Indian, Kannada, Malayalam, Marathi, Telugu
Blue Sky; Blue
Boy/Male
Hindu
Blue, With blue eyes
Surname or Lastname
English
English : variant spelling of Bligh.
Girl/Female
Persian English French
Blue.
BLUE LOOP
BLUE LOOP
Girl/Female
Greek
A Fate.
Boy/Male
Tamil
Protector of fame
Girl/Female
African, Australian, Christian, Dutch, German, Japanese, Norse, Swedish
Ever Ruling; Eternal Ruler
Boy/Male
Indian, Sanskrit
Without Greed
Girl/Female
Native American
Dance.
Boy/Male
Arabic African Muslim Biblical
Peace.
Girl/Female
Welsh
Wretched.
Surname or Lastname
English
English : metonymic occupational name for someone who used a balance (scales), Anglo-French and Middle English balaunce, from Old French balance.
Boy/Male
Irish
From the smooth field.
Girl/Female
Australian, British, English, French, Latin
Born Fifth
BLUE LOOP
BLUE LOOP
BLUE LOOP
BLUE LOOP
BLUE LOOP
a.
Of inflexible honesty and fidelity; -- a term derived from the true, or Coventry, blue, formerly celebrated for its unchanging color. See True blue, under Blue.
superl.
Severe or over strict in morals; gloom; as, blue and sour religionists; suiting one who is over strict in morals; inculcating an impracticable, severe, or gloomy mortality; as, blue laws.
superl.
Suited to produce low spirits; gloomy in prospect; as, thongs looked blue.
imp. & p. p.
of Blue
n.
Alt. of Blue-bonnet
a.
Dark blue or bluish gray; lead-colored.
a.
Having blue eyes.
a.
Having the blue color of the sky; azure; as, a sky-blue stone.
superl.
Having the color of the clear sky, or a hue resembling it, whether lighter or darker; as, the deep, blue sea; as blue as a sapphire; blue violets.
a.
Deep blue, like smalt.
n.
The blue-cheeked honeysucker of Australia.
v. t.
To make blue; to dye of a blue color; to make blue by heating, as metals, etc.
superl.
Low in spirits; melancholy; as, to feel blue.
a.
Having blue veins or blue streaks.
n.
See Saunders-blue.
n.
The European blue titmouse (Parus coeruleus); the bluecap.
superl.
Pale, without redness or glare, -- said of a flame; hence, of the color of burning brimstone, betokening the presence of ghosts or devils; as, the candle burns blue; the air was blue with oaths.