This new class of exoplanets has the lowest density of any planets discovered outside of our solar system.
Cheops, to be launched on Soyuz-Fregat rocket, is a new telescope whose name stands for CHaracterising ExOPlanet Satellite.
Four spacewalks are needed to fix the spectrometer that will hunt for dark matter and antimatter for 8 ½ years.
The planet was named Ultima Thule after a mythical European land that is beyond the borders of the known world.
The carbon atoms is one of the three identified compounds that are found in the interstellar medium.
A supernova is an exploding star that reached the end of its life and is sometimes brighter than the Sun.
The storms on Neptune are so giant in size that their longest dimension is the size of the Earth.
The new mass estimate puts our galaxy on the beefier side compared to other galaxies in the universe.
The new moon & Neptune's second largest, Proteus, are suspiciously close in the context of astronomy.
The mysterious dark storm was discovered by Hubble during Neptune's southern summer.
Researchers used the Hubble Telescope to study white dwarf stars within the globular cluster NGC 6752.
Wide Field Camera 3 on the Hubble Space Telescope had shut on 8 January due to a hardware problem.
Hubble's 3 other science instruments are still working fine, with celestial observations continuing.
The explorer travelled 4 billion-mile to a frozen rock at the edge of the solar system.
NASA will ring in the New Year with a live online broadcast to mark flyby of the Ultima Thule.
On Saturday, it posted an image on its Instagram handle that showed two yellow orbs above an arc of light — painting a smiley face in space.
Hubble is observing such stars through a large programme called HAZMAT.
NASA's Chandra X-Ray Observatory has entered a protective "safe mode".
As a result, Hubble remains in so-called safe mode and all science observations are on hold.
The exomoon is unusual because of its large size, comparable to the diameter of Neptune.