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Astronomical object not gravitationally bound to a star
An interstellar object is an astronomical object in interstellar space, not gravitationally bound to a star. The term is used for objects including some
Interstellar_object
Interstellar object that passed near Earth in 2017
1I/ʻOumuamua is the first confirmed interstellar object detected passing through the Solar System. Formally designated 1I/2017 U1, it was discovered by
1I/ʻOumuamua
Interstellar comet in 2025
no threat. The prefix "3I" designates it as the third confirmed interstellar object passing through the Solar System, after 1I/ʻOumuamua and 2I/Borisov
3I/ATLAS
Israeli-American theoretical physicist (born 1962)
System. He has argued that ʻOumuamua and other interstellar objects, including the reputedly interstellar meteor CNEOS 2014-01-08, are potential examples
Avi_Loeb
Purported interstellar meteor that hit Earth on 8 January 2014
the northeast coast of Papua New Guinea. It was claimed to be an interstellar object in a 2019 preprint by astronomers Amir Siraj and Avi Loeb, and this
CNEOS_2014-01-08
Search for extraterrestrial intelligence
telescopes to systematically look for artifacts in Earth's orbit, interstellar objects, and unexplained craft, sometimes called "anomalous aerial vehicles"
The_Galileo_Project
Planet not gravitationally bound to a star
free-floating planet (FFP) or an isolated planetary-mass object (iPMO), is an interstellar object of planetary mass which is not gravitationally bound to
Rogue_planet
Interstellar comet in 2019
(Borisov), is the first observed rogue comet and the second observed interstellar interloper, after ʻOumuamua. It was discovered by the amateur astronomer
2I/Borisov
Canadian astronomer
University of Hawaiʻi at Mānoa, where he discovered the first known interstellar object, ʻOumuamua. He has also published numerous articles on meteors and
Robert_Weryk
Hypothetical travel between stars or planetary systems
Interstellar travel is the hypothetical travel of spacecraft between star systems. Due to the vast distances between the Solar System and nearby stars
Interstellar_travel
Time between earliest and latest observations of a Solar System body
out a Mars impact by Oort cloud comet C/2013 A1 (Siding Spring). Interstellar objects generally require an observation arc of 2–3 weeks using hundreds
Observation_arc
Matter and radiation in the space between the star systems in a galaxy
ISM on August 25, 2012, making it the first artificial object from Earth to do so. Interstellar plasma and dust will be studied until the estimated mission
Interstellar_medium
American astrophysicist
PhD at Princeton University. His research is primarily focused on interstellar objects, asteroids and comets, planetary system formation and evolution,
Amir_Siraj
Any astronomical object that exists outside the Solar System
astronomy, the study of objects outside the Milky Way Galaxy Interstellar object, an object that has traveled through interstellar space, such as ʻOumuamua
Extrasolar_object
Star formed in the same star cluster as the Sun
comet C/2018 V1 (Machholz–Fujikawa–Iwamoto) found that it may be an interstellar object, and identified two stars it may have originated from (Gaia DR2 1927143514955658880
Solar_sibling
Study of missions to interstellar objects
of a mission to interstellar objects such as ʻOumuamua and 2I/Borisov, initiated on 30 October 2017 by the Initiative for Interstellar Studies (i4is).
Project_Lyra
Distant planetesimals in the Solar System
detecting objects in the Oort cloud. Heliosphere Hills cloud Interstellar object List of possible dwarf planets List of trans-Neptunian objects Nemesis
Oort_cloud
2021 book by Avi Loeb
detection of ʻOumuamua, the first known interstellar object to pass through the Solar System. Loeb speculates that the object might be an extraterrestrial artifact
Extraterrestrial: The First Sign of Intelligent Life Beyond Earth
Extraterrestrial:_The_First_Sign_of_Intelligent_Life_Beyond_Earth
Natural object in space that releases gas
A comet is an icy, small Solar System body or interstellar object that warms and begins to release gases when passing close to the Sun, a process called
Comet
following a loss of contact the previous month. The third ever confirmed interstellar object to pass into our Solar System, 3I/ATLAS, is discovered by the Asteroid
2025_in_science
Hypothetical satellite which would use a solar sail to modify its orbit
of statites has been proposed for performing a rendezvous with an interstellar object. A so-called quasite is a variation of a statite, being slightly
Statite
Interstellar cloud in the Milky Way Galaxy
The Local Interstellar Cloud (LIC), also known as the Local Fluff, is an interstellar cloud roughly 30 light-years (9.2 pc) across, through which the
Local_Interstellar_Cloud
Space probe that can travel out of the Solar System
An interstellar probe is a space probe that has left—or is expected to leave—the Solar System and enter interstellar space, which is typically defined
Interstellar_probe
Interstellar absorption and scattering of light
radiation by dust and gas between an emitting astronomical object and the observer. Interstellar extinction was first documented as such in 1930 by Robert
Extinction_(astronomy)
NASA satellite of the Explorer program
detected. 2025: Swift's UVOT instrument discovers hydroxyl on the interstellar object 3I/ATLAS, indicating it has water. Spaceflight portal List of gamma-ray
Neil Gehrels Swift Observatory
Neil_Gehrels_Swift_Observatory
Structural component of some galaxies
object from outside the Solar System. Applying the Ōtautahi–Oxford model of the interstellar object population to the trajectory of the interstellar comet
Thick_disk
Topics referred to by the same term
Route 525 1I/2017 U1 (ʻOumuamua), abbreviated 1I, the first observed interstellar object passing through the Solar System. One eye CACNA1I I1 (disambiguation)
1I
1973 science fiction novel by Arthur C. Clarke
Spaceguard system to track potentially hazardous objects in space. In 2131, Spaceguard detects an interstellar object entering the Solar System, designating it
Rendezvous_with_Rama
Two phonograph records on board Voyager spacecraft
is currently the farthest human-made object from Earth. Both Voyager 1 and Voyager 2 have reached interstellar space, the region between stars where
Voyager_Golden_Record
Early-access video game
terminals to locate, record, and download various interstellar radio signals from interstellar objects such as stars, exoplanets, satellites, and sometimes
Voices_of_the_Void
Retrograde asteroid discovered in 2014
only been studied a few years before the object's discovery. One study suggests that it was an interstellar asteroid captured 4.5 billion years ago into
514107_Kaʻepaokaʻāwela
British nonprofit
of interstellar travel. It pioneered concepts of small-scale laser sail interstellar probes (Project Dragonfly) and missions to interstellar objects (Project
Initiative for Interstellar Studies
Initiative_for_Interstellar_Studies
A clear example of this is the eccentricities of the two known interstellar objects as of October 2019, 1I/ʻOumuamua and 2I/Borisov. ʻOumuamua had an
List of Solar System objects by greatest aphelion
List_of_Solar_System_objects_by_greatest_aphelion
Index of articles associated with the same name
encounter with Saturn in 2022 3I/ATLAS (C/2025 N1), the third known interstellar object ever discovered passing through the Solar System "Comet ATLAS" may
Comet_ATLAS
Small Solar System body with an orbit that can bring it close to Earth
Asteroid Day Asteroid Redirect Mission Claimed moons of Earth EURONEAR Interstellar object List of Earth-crossing asteroids List of impact structures on Earth
Near-Earth_object
Class of asteroids
orbital characteristics. The first object that exhibited “dark comet” behavior was ‘Oumuamua, an interstellar object discovered in 2017, which was found
Dark_comet
British astrophysicist
new interstellar object discovered! | Night Sky News July 2025 (YouTube video). Retrieved 10 July 2025. Smethurst, Becky (14 May 2026). Interstellar comet
Becky_Smethurst
Overview of the events of 2022 in science
sensors, confirms the detection of the first known interstellar object. The purported interstellar meteorite, technically known as CNEOS 2014-01-08, impacted
April–June_2022_in_science
also in heliocentric orbits. Given the huge emptiness of interstellar space, all the objects listed here are likely to continue into deep space in timelines
List of artificial objects leaving the Solar System
List_of_artificial_objects_leaving_the_Solar_System
interstellar object, added to the system in 2017 to allow the reclassification of ʻOumuamua (1I/2017 U1). As of 2025[update], the only other objects with
Naming_of_comets
Spacecraft designed for interstellar travel
A starship, starcraft, or interstellar spacecraft is a theoretical spacecraft designed for traveling between planetary systems. The term is mostly found
Starship
Small patches of nebulosity associated with newly born stars
clouds of interstellar space (the interstellar medium or ISM). Hubble Space Telescope observations have revealed the complex evolution of HH objects over the
Herbig–Haro_object
Area of the Solar System beyond the planets, comprising small bodies
any objects that happen to lie in certain regions, and either sends them into the inner Solar System or out into the scattered disc or interstellar space
Kuiper_belt
Astronomical theory about the Solar System
processed-type meteorites are chunks from shattered massive planetesimals. Interstellar objects could have been captured, and become part of the young Solar system
Nebular_hypothesis
Solar system objects beyond Neptune
dedicated Interstellar Precursor in the 21st century, one intentionally designed to reach the interstellar medium, and as part of this the flyby of objects like
Trans-Neptunian_object
Disked object in the constellation Centaurus
thought it was unlikely. Their reasoning was that stars and other interstellar objects are typically separated extremely far apart from each other (projected
J1407b
Transitional concept of geologic time
produce interstellar object or eject rogue planets from their original systems, transferring geological material across vast distances. Such objects could
Rock_cycle
Telescope at Palomar Observatory in California, USA
Telescope was able to record the spectrum of the first recognized interstellar object, 1I/2017 U1 ("ʻOumuamua"); while no specific mineral was identified
Hale_Telescope
time, the release of cyanide gas and dust from an interstellar object, particularly from the interstellar comet 2I/Borisov. 30 September – By combining doses
2019_in_science
1993 video game
crash-lands in the grounds of a humble American circus. The goo from the interstellar object contaminates all of the circus's attractions, transforming them into
ClayFighter_(video_game)
Astronomical object not orbiting the Sun
therefore have no cometary coma. Most of these objects will only be weakly hyperbolic and will not be of interstellar origin. The planets and most satellites
Hyperbolic_asteroid
Distant body in the outer Solar System
ultraviolet radiation, interstellar particles, and other harsh environs as the dwarf planet either comes close to the Sun or transits interstellar space. Its surface
Sedna_(dwarf_planet)
Branch of astronomy
unbound to solar gravitation and became interstellar objects just like ʻOumuamua the first interstellar object detected passing through the Solar System
Dust_astronomy
Planetary system consisting of the Sun and objects orbiting it
Milky Way. Large objects outside the heliopause remain gravitationally bound to the Sun, but the flow of matter in the interstellar medium homogenizes
Solar_System
Hypothesis on the interstellar spreading of primordial life
rotating object. Analysis of its orbit provided evidence that it was an interstellar object, originating from outside the Solar System, accelerating away from
Panspermia
Object in the Solar System
Bodies'. The definition excludes interstellar objects traveling through the Solar System, such as the interstellar interlopers 1I/ʻOumuamua, 2I/Borisov
Small_Solar_System_body
Spacecraft: Determination of the Non-gravitational Accelerations of the Interstellar Object 3I/ATLAS". Research Notes of the American Astronomical Society. 9
List of Solar System objects by size
List_of_Solar_System_objects_by_size
2022 TV series or program
Astrobiologist Jacob Haqq Misra describes the discovery of the interstellar object, 'Oumuamua. Its intriguing characteristics prompted speculation that
Rendezvous_with_the_Future
Index of lists with the same name
H1 (PanSTARRS) C/2026 O1 (PanSTARRS) 1I/'Oumuamua, the very first interstellar object ever discovered This set index article is a list of articles associated
List of Pan-STARRS discoveries
List_of_Pan-STARRS_discoveries
Interstellar or intergalactic object
A rogue black hole is a black hole that is not bound by any object's gravity, allowing it to float freely throughout the universe. Since black holes emit
Rogue_black_hole
from the interstellar medium Outline of the Solar System Lists of astronomical objects List of natural satellites List of Solar System objects by size
List_of_Solar_System_objects
planets are the furthest from the Sun as of January 2026[update]. The objects have been categorized by their approximate distance from the Sun on that
List of Solar System objects most distant from the Sun
List_of_Solar_System_objects_most_distant_from_the_Sun
attacks in modern history. October 28: 'Oumuamua, the first known interstellar object, is identified. November 5: 26 people are killed in a church shooting
Timeline_of_the_21st_century
Comets with orbital periods under 200 years
for an interstellar object, or "A" for an object that was either mistakenly identified as a comet, but is actually a minor planet, or for an object on a
List_of_periodic_comets
Void between celestial bodies
August 2012, Voyager 1 became the first man-made object to leave the Solar System and enter interstellar space. The participation and representation of
Outer_space
Size-based definition of celestial objects
formation have suggested that some objects of planetary mass would be ejected into interstellar space. Such objects are typically called rogue planets
Planetary-mass_object
farther than Pluto. 2019 – 2I/Borisov, the first interstellar comet and second interstellar object, is discovered. 2022 – The Double Asteroid Redirection
Timeline of Solar System astronomy
Timeline_of_Solar_System_astronomy
Ongoing NASA interstellar program
The Voyager program is an American scientific program that employs two interstellar probes, Voyager 1 and Voyager 2. They were launched in 1977 to take advantage
Voyager_program
Planetary defence spacecraft developed by the ESA
2025, Hera was passing through the cometary tail of the third known interstellar object, the comet 3I/ATLAS. The spacecraft flew 8.2 million km from the
Hera_(space_mission)
American space science communicator (born 1985)
million Fifth place – The discovery of Oumuamua, the first known interstellar object to pass through the Solar System Fourth place – Observation of both
Tim_Dodd
Communication between planetary systems
Interstellar communication is the transmission of signals between planetary systems. Sending interstellar messages is potentially much easier than interstellar
Interstellar_communication
Carbon monoxide-rich comet
like Pluto, as such objects are known to be abundant in hypervolatiles. A similar scenario has been proposed for the interstellar object 1I/ʻOumuamua. For
C/2016_R2_(PanSTARRS)
Amount by which an orbit deviates from a perfect circle
and will eventually leave the Solar System. ʻOumuamua is the first interstellar object to be found passing through the Solar System. Its orbital eccentricity
Orbital_eccentricity
Minor planet found within the inner Solar System
main asteroid belt except for ʻOumuamua, an interstellar object, which was the first asteroid-like object to show non-gravitation acceleration, while
Asteroid
Apparent unusual observation in the sky
An unidentified flying object (UFO) is an object or phenomenon seen in the sky but not yet identified or explained. The term was coined when United States
Unidentified_flying_object
European–Japanese spacecraft to launch in 2029
can be studied. There is also the potential of intercepting an interstellar object passing through the Solar System, if the speed and direction permit
Comet_Interceptor
Radio telescope in Green Bank, WV, US
extraterrestrial technologies. In late 2017, the telescope was used to scan the interstellar object ʻOumuamua for signs of extraterrestrial intelligence as it passed
Green_Bank_Telescope
1984 novel by William Sleator
Children and Young Adult Literature portal Interstellar Pig, published in 1984 by Bantam Books, is a science fiction novel for young adults written by
Interstellar_Pig
Region of space dominated by the Sun
the same in 2018. The twin Voyagers are the only man-made objects to have entered interstellar space. However, while they have left the heliosphere, they
Heliosphere
NASA space probe launched in 1977
part of the Voyager program, to study the outer Solar System and the interstellar space beyond the Sun's heliosphere. It was launched 16 days after its
Voyager_1
Amateur astronomer who discovered the first known interstellar comet
telescope to discover the first known interstellar comet, 2I/Borisov, which is only the second interstellar object to have been observed. Borisov described
Gennadiy_Borisov
from which the interstellar object ʻOumuamua, found passing through the Solar System in October 2017, may have begun its interstellar journey. Studies
2018_in_science
Unmanned robotic spacecraft
regions of the Solar System. Voyager 1 became the first human-made object to enter interstellar space in 2012. More recent missions such as Parker Solar Probe
Space_probe
Overview of the events of 2020 in science
fragmentation of the interstellar comet 2I/Borisov. A follow-up study, reported on 6 April 2020, observed only a single object, and noted that the fragment
April–June_2020_in_science
Dust floating in space
processes occurring in the interstellar medium. Cosmic dust was once solely an annoyance to astronomers, as it obscures objects they wished to observe. When
Cosmic_dust
Overview of the events of 2022 in science
known interstellar object, CNEOS 2014-01-08, and members of The Galileo Project, report the discovery of an additional candidate interstellar meteor
July–September 2022 in science
July–September_2022_in_science
European mission to study Jupiter and its moons since 2023
pointing it toward the Sun. The interstellar comet 3I/ATLAS, discovered in July 2025 as only the third known interstellar object in the Solar System, made its
Jupiter_Icy_Moons_Explorer
Pre-stellar core in the constellation Serpens
light-years away. This massive accumulation of gas and dust was the interstellar object in which the phenomenon of coreshine was first investigated by astronomers
L183
Proposed concepts for the human colonization of trans-Neptunian objects
clouds, by using natural objects as slow interstellar vessels with substantial natural resources; and that such interstellar colonies could also serve
Colonization of trans-Neptunian objects
Colonization_of_trans-Neptunian_objects
Star system in the Centaurus constellation
Manasvi; Hibberd, Adam; Fries, Dan; Perakis, Nikolaos; et al. (2021). "Interstellar objects in the Solar System: 1. Isotropic kinematics from the Gaia early
Alpha_Centauri
moving within (or near) the Local Interstellar Cloud, roughly 30 light-years (9.2 pc) across. The Local Interstellar Cloud is, in turn, contained inside
List_of_nearest_stars
Former Director of Icarus Interstellar
at an interstellar speed. Adam Crowl together with Harvard astronomer Avi Loeb and Adam Hibberd suggested in media statements that this object—the third
Adam_Crowl
New Zealand astrophysicist, science communicator
Explorer. She was involved with the observation of ʻOumuamua, an interstellar object from another solar system that passed through our own in 2017. She
Michele_Bannister
Multi-telescope astronomical survey
trojan objects tracked over longer periods of time by Pan-STARRS.[citation needed] In 2017, Pan-STARRS detected the first known interstellar object, 1I/2017
Pan-STARRS
NASA space probe launched in 1977
instruments to study celestial objects as it traveled through space. Built with the intent for eventual interstellar travel, Voyager 2 included a large
Voyager_2
Topics referred to by the same term
11th Marine Artillery Regiment (11th RAMa) a previous name of the interstellar object ʻOumuamua Search for "Rama" on Wikipedia. Raam (disambiguation) Ram
Rama_(disambiguation)
(NASA) ESA Italy (ASI) Cassini–Huygens 19 October 2017 First known interstellar object detected passing through the Solar System. USA (Haleakalā Observatory)
Timeline_of_space_exploration
Type of interstellar cloud that obscures visible light
a type of interstellar cloud, particularly molecular clouds, that is so dense that it obscures the visible wavelengths of light from objects behind it
Dark_nebula
(1988-07-01). "Hydrogen and Calcium in DB White Dwarfs: A Case for Interstellar Accretion". The Astrophysical Journal. 330: L55. Bibcode:1988ApJ...330L
List of exoplanets and planetary debris around white dwarfs
List_of_exoplanets_and_planetary_debris_around_white_dwarfs
Initiative to search for intelligent extraterrestrial life
"Tabby's Star" with its bizarre dimming behavior; ʻOumuamua – the interstellar object that passed near Earth in 2017; unexplained optical pulses that last
Breakthrough_Listen
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INTERSTELLAR OBJECT
INTERSTELLAR OBJECT
INTERSTELLAR OBJECT
INTERSTELLAR OBJECT
INTERSTELLAR OBJECT
INTERSTELLAR OBJECT
INTERSTELLAR OBJECT
INTERSTELLAR OBJECT
INTERSTELLAR OBJECT
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