First suspected 'exomoon' discovered 8,000 light-years away

This is an artist's illustration of what a Neptune-size moon would look like orbiting the gas giant Kepler-1625b exoplanet in a star system 8,000 light-years from Earth. It could be the first exomoon ever discovered.

An artist's illustration of Planet X, which could be more often than not.

This is an artist's concept of what SIMP J01365663 + 0933473 might look like. It has 12.7 times the mass of Jupiter but a magnetic field 200 times more powerful than Jupiter's. This object is 20 light-years from Earth. It is on the boundary line between being a planet or being a brown dwarf.

The Andromeda galaxy cannibalized and shredded the M32p, leaving behind this compact galaxy remnant known as M32. It is completely unique and contains a wealth of young stars.

Twelve new moons have been found around Jupiter. This graphic shows various groupings of the moons and their orbits, with the newly discovered ones shown in bold.

Scientists and observatories around the world were able to trace a high-energy neutrino to a galaxy with a supermassive, rapidly spinning black hole at its center, known as a blazar. The galaxy sits to the left of Orion's shoulder in his constellation and is about 4 billion light-years from Earth.

'Oumuamua, the first observed interstellar visitor to our solar system, is shown in an artist's illustration.

Planets do not just appear out of thin air – but they do not require gas, dust and other processes not fully understood by astronomers. This is an artist's impression of what "infant" planets look like forming around a young star.

These negative images of 2015 BZ509, which is circled in yellow, show the first known interstellar object that has become a permanent part of our solar system. The exo-asteroid was introduced to the system 4.5 billion years ago. It then settled into a retrograde orbit around Jupiter.

A close look at the diamond matrix in a meteorite that landed in Sudan in 2008. This is considered to be the first evidence of a proto-planet that helped the terrestrial planets in our solar system.

2004 EW95 is the first carbon-rich asteroid confirmed to exist in the Kuiper Belt and a relic of the primordial solar system. This curious object has been formed as a whole between Mars and Jupiter before being flung into the Kuiper Belt.

The NASA / ESA Hubble Space Telescope is celebrating its 28th anniversary with this stunning and colorful image of the Lagoon Nebula 4,000 light-years from Earth. While the whole nebula is 55 light-years across, this image only reveals a portion of about four light-years.

This is a more star-filled view of the Lagoon Nebula, using Hubble's infrared capabilities. The reason you can see the stars is because of the presence of young people in the nebula, more distant stars in the background.

The Rosette Nebula is 5,000 light-years from Earth. The distinctive nebula, which has a claim to a skull, has a hole in the middle that creates the illusion of its rose-like shape.

An illustration depicts the detection of a fast repeating radio burst from a mysterious source 3 billion light-years from Earth.

KIC 8462852, also known as Boyajian's Star or Tabby's Star, is 1,000 light-years from us. It's 50% bigger than our sun and 1,000 degrees hotter. And it does not behave like any other star, dimming and brightening sporadically. Dust around the star, depicted here in an artist's illustration, may be the most likely cause of its strange behavior.

Martian crater has several seasonal streaks called "recurrent slope lineae," or RSL, which a November 2017 report interprets as granular flows, rather than darkening due to flowing water. The image is from the HiRISE camera on NASA's Mars Reconnaissance Orbiter.

This artist's print shows a supernova explosion, which contains the luminosity of 100 million suns. Supernova iPTF14hls, which has exploded multiple times, may be the most massive and longest-lasting ever observed.

This illustration shows hydrocarbon compounds splitting into carbon and hydrogen inside ice giants, such as Neptune, turning into a "diamond (rain) shower."

This striking image is the stellar nursery in the Orion Nebula, where stars are born. The red filament is a stretch of ammonia molecules measuring 50 light-years long. The blue represents the gas of the Orion Nebula. This image is a composite of Robert C. Byrd's Green Bank Telescope and NASA's Wide-field Infrared Survey Explore telescope. "We still do not understand in detail how large clouds of gas in our Galaxy collapse to form new stars," said Rachel Friesen, one of the collaboration's co-Principal Investigators. "But ammonia is an excellent tracer of dense, star-forming gas."

This is what Earth and its moon look like from Mars. The image is a composite of the best image and the best moon image taken on November 20, 2016 by NASA's Mars Orbiter Recognition. The orbiter's camera takes infrared, red and blue-green images. Mars was about 127 million miles from Earth when the images were taken.

PGC 1000714 was originally thought to be a common elliptical galaxy, but a closer analysis revealed the incredibly rare discovery of a Hoag-type galaxy. It has a round core encircled by two detached rings.

NASA's Cassini spacecraft took these images of the planet's mysterious hexagon-shaped jetstream in December 2016. The hexagon was discovered in images taken by the Voyager spacecraft in the early 1980s. It's estimated to have a diameter larger than two Earths.

A dead star gives a greenish glow in this Space Hubble Space Telescope image of the Crab Nebula, located about 6,500 light years from Earth in the Taurus constellation. NASA released the image for Halloween 2016 and played the theme in its press release. The agency said "ghoulish-looking object still has a pulse." At the center of the Crab Nebula is the crushed core, or "heart" of an exploded star. The heart is spinning 30 times per second and producing a magnetic field that provides 1 trillion volts, NASA said.

The Terzan 5 Terzan is one of the most important building blocks in the world. relic of the early days of the Milky Way.

An artist's design of Planet Nine, which would be the farthest planet within our solar system. The similar cluster orbits of extreme objects on the edge of our solar system suggest a massive planet is located there.

An illustration of the orbits of the new and previously known remote remote Solar System objects. The clustering of most of their orbits indicates that they are likely to be affected by something massive and very remote, the proposed Planet X.

Say hello to dark galaxy Dragonfly 44. Like our Milky Way, it has a halo of spherical clusters of stars around its core.

A classical nova occurs when a white dwarf star gains from its secondary star (a red dwarf) over a period of time, causing a thermonuclear reaction on the surface that eventually erupts in a single visible outburst. This creates a 10,000-fold increase in brightness, depicted here in an artist's rendering.

Gravitational lensing and space warping are visible in this image of near and distant galaxies captured by Hubble.

At the center of our galaxy, the Milky Way, researchers discovered an X-shaped structure within a tightly packed group of stars.

Meet UGC 1382: What astronomers thought was a normal elliptical galaxy (left) was actually revealed to be a massive disc galaxy made up of different parts when viewed with ultraviolet and deep optical data (center and right). In a complete reversal of normal galaxy structure, the center is younger than its outer spiral disk.

NASA's Hubble Space Telescope captured this image of the Crab Nebula and its "beating heart," which is a neutron star at the right of the two bright stars in the center of this image. The pulsating star neutron 30 times a second. The rainbow colors are visible due to the movement of materials in the nebula during the time-lapse of the image.

The Hubble Space Telescope captured an image of a hidden galaxy that is fainter than Andromeda or the Milky Way. This UGC 477 is over 110 million light-years away in the constellation of Pisces.

On April 19, NASA released new images of bright craters on Ceres. This photo shows the Haulani Crater, which has evidence of landslides from its rim. Scientists believe that they are bright because they are relatively new.

This illustration shows the millions of dust NASA's Cassini spacecraft has sampled near Saturn. A few dozen of them appear to come from beyond our solar system.

This video from the VLT Survey Telescope at ESO 's Paranal Observatory in Chile shows a stunning concentration of galaxies known to the Fornax Cluster, which can be found in the Southern Hemisphere. At the center of this cluster, in the middle of the three bright blobs on the left side of the image, lies a galaxy cd – a galactic cannibal that has grown in size by sharing smaller galaxies.

This image shows the central region of the Tarantula Nebula in the Large Magellanic Cloud. The young and dense star cluster R136, which contains hundreds of massive stars, is visible in the lower right of the image taken by the Hubble Space Telescope.

In March 2016, astronomers published a paper on powerful red flashes coming from a binary V404 Cygni in 2015. This illustration shows a black hole, similar to the one in V404 Cygni, devouring material from an orbiting star.

This image shows the elliptical galaxy NGC 4889, deeply embedded within the Coma galaxy cluster. There is a gigantic supermassive black hole at the center of the galaxy.

An artist's impression of 2MASS J2126, which takes 900,000 years to orbit its star, 1 trillion kilometers away.

Caltech researchers have found evidence of a giant planet tracing a weird, highly elongated orbit in the outer solar system. The object, nicknamed Planet Nine, has a mass about 10 times that of Earth and orbits about 20 times farther from the sun on average than does Neptune.

An artist's impression of what a black hole might look like. In February, researchers in China said they had spotted a super-massive black hole 12 billion times the size of the sun.

Are there are oceans on any of Jupiter's moons? The Juice Probe is shown in this artist's print. Picture courtesy of ESA / AOES

Astronomers have discovered powerful auroras on a brown dwarf that is 20 light-years away. This is an artist's concept of the phenomenon.

Venus, bottom, and Jupiter shine brightly above Matthews, North Carolina, on Monday, June 29. The apparent close encounter, called a conjunction, has been giving a dazzling display in the summer sky. Although the two planets appear to be close together, they are millions of miles apart.

Jupiter's icy moon Europa may be the best place in the solar system to look for extraterrestrial life, according to NASA. The moon is about the size of Earth's moon, and there is evidence it has an ocean beneath its frozen crust. NASA's 2016 budget includes a request for $ 30 million to plan a mission to investigate Europa. The image above was taken by the Galileo spacecraft on November 25, 1999. It's a 12-frame mosaic and is considered the best image yet of the Europa side that faces Jupiter.

This nebula, gold cloud of gas and dust, is called RCW 34 or Gum 19. The brightest areas are where the gas is being heated by young stars. Eventually the gas burst outward like champagne after a bottle is uncorked. Scientists call this champagne flow. This new image of the nebula was captured by the European Space Organization's Very Large Telescope in Chile. RCW 34 is in the constellation Vela in the southern sky. The name means "sails of a ship" in Latin.

The Hubble Space Telescope captured images of Jupiter's three great moons – Io, Callisto, and Europa – passing by at once.

Using powerful optics, astronomers have found a planet-like body, J1407b, with 200 times the size of Saturn's rings. This is an artist's depiction of the rings of planet J1407b, which are eclipsing a star.

A patch of stars appears in this image from the La Silla Observatory in Chile. Lynds Dark Nebula 483. The cloud is about 700 light years from Earth in the constellation Serpens (The Serpent).

This is the largest Hubble Space Telescope image ever assembled. It's a portion of the galaxy next door, Andromeda (M31).

NASA has captured a stunning new image of the so-called "Pillars of Creation," one of the space agency's most iconic discoveries. The giant columns of cold gas, in a small region of the Eagle Nebula, were popularized by a similar image taken by the Hubble Space Telescope in 1995.

Astronomers using the Space Hubble Space picture that shows a small section of space in the southern hemisphere Constellation Fornax. Within this deep-space image are 10,000 galaxies, going back in time to a few hundred million years after the Big Bang.

Planetary Nebula Abell 33 appears ring-like in this image, taken using the European Southern Observatory's Very Large Telescope. The blue bubble was created when a diamond star rings its outer layers and has a diamond engagement ring effect.

This Hubble image looks like a floating marble or a giant, disembodied eye. But it's actually a nebula with a giant star at its center. Scientists think the world is more important than our sun, but it is dying and is destined to go supernova.