Comet Siding Spring Animation

Stratigraphy in Gale Crater on Mars indicates the effects of megafloods in the distant past, most likely caused by the heat released in a major impact.

Early risers wishing to see Venus as a dazzling ‘morning star’ need only glance low to the east in the pre-dawn sky. The planet reaches greatest brilliancy on Sunday, 20 September when, for a couple of mornings, it can be seen outshining brightest nighttime star Sirius in the southeast by a factor of seventeen times. Can you see your shadow cast by Venus?

Intermittent flows that appear on steep slopes on Mars are likely formed by flowing sand, and not water as some scientists previously suspected, according to a new study.