Solar System
How Long is a Day on Mercury?
1/3 the distance from the Sun than Earth, it should be no surprise that a day on Mercury is a…
A Color View of Darling Dione
Color-composite of Dione made from raw Cassini images acquired on Dec. 23, 2012. (NASA/JPL/SSI. Composite by J. Major.) Although made…
Valles Marineris: The Grandest Canyon of All
A digital terrain model of a portion of Mars' Valles Marineris, the largest canyon in the Solar System. Credit: ESA/DLR/FU…
Voyager 1 May Have Left the Solar System
Number of particles from the Sun hitting Voyager 1. Credit: NASA While there's no official word from NASA on this,…
Pictures From T-86: Cassini’s Latest Flyby of Titan
On September 26-27 Cassini executed its latest flyby of Titan, T-86, coming within 594 miles (956 km) of the cloud-covered…
Vesta’s Deep Grooves Could Be “Stretch Marks” From Impact
Dawn image of Vesta showing its nearly circumferential equatorial grooves (NASA/JPL-Caltech/UCLA/MPS/DLR/IDA) Even though NASA's Dawn spacecraft has departed Vesta the…
Planets in our Solar System May Have Formed in Fits and Starts
Solar shockwaves would have produced proto-planetary rings at different times, meaning the planets did not form simultaneously (artist concept). Credit:…
Researchers Present the Sharpest Image of Pluto Ever Taken from Earth
A "speckle image" reconstruction of Pluto and its largest moon, Charon (Gemini Observatory/NSF/NASA/AURA) Real planet, dwarf planet, KBO, who cares?…
How Many Asteroids Are Out There?
Answer: a LOT. And there's new ones being discovered all the time, as this fascinating animation by Scott Manley shows.…
Saturn Shows Off Its Shadow
Take a look up at the enormous shadow cast by Saturn onto its own rings in this raw image, acquired…