Category: planet



Water-World Exoplanet

An ocean planet, ocean world, water world, aquaplanet or panthalassic planet is a type of terrestrial planet that contains a substantial amount of water either at its surface or subsurface.

Earth is the only astronomical object known to have bodies of liquid water on its surface, although several exoplanets have been found with the right conditions to support liquid water. For exoplanets, current technology cannot directly observe liquid surface water, so atmospheric water vapor may be used as a proxy. The characteristics of ocean worlds—or ocean planets—provide clues to their history, and the formation and evolution of the Solar System as a whole. Of additional interest is their potential to originate and host life.

Water worlds are of extreme interest to astrobiologists for their potential to develop life and sustain biological activity over geological timescales. The five best established water worlds in the Solar System include Europa, Enceladus, Ganymede, and Callisto. A host of other bodies in the outer Solar System are inferred by a single type of observation or by theoretical modeling to have subsurface oceans, and these include: Dione, Pluto, Triton, and Ceres, as well as Mimas, Eris, and Oberon. read more

Neptune 1989-08-17

Image credit: Judy Schmidt

Saturn in Near UV and Blue

image credit;

Judy Schmidt

Jupiter Marble

Hubble Tracks the Lifecycle of Giant Storms on Neptune


Real spacecraft

Mars InSight lander entering martian atmosphere. Good luck with the landing!

UPDATE: Mars InSight lander has just touched down on Mars. Congrats to NASA and ESA teams for achieving this 🙂

Find out more about InSight mission –

Six Things to Know About NASA’s Opportunity Mars Rover:

Opportunity’s mission is complete. Here are highlights from its time on Mars.

Hubble helps uncover origin of Neptune’s smallest moon Hippocamp