If, for example, the gas giants had grown slightly less — well, giant — there might have been room and material for a super-Earth just beyond Mars. Advertisement ...

A very thin crescent moon, less than 5% illuminated, will appear low in the sky next to Mercury, Mars and Venus.Of the three planets, Venus will be most visible, shining bright during its current ...

All month, Venus, Saturn, Jupiter and Mars will appear to line up and be bright enough to see with the naked eye in the first few hours after dark. This weekend, Venus and Saturn get especially cozy.

The Earth is the only rocky planet with a substantial moon. Mercury and Venus have nothing at all, and Mars only has two tiny captured asteroids to call its own. Large moons are much more prolific ...

Consider this documentary-style eye-candy, spoiler-free outside of giving a glimpse at Earth in the year 2330. The video showcases a brief look at Mercury, Venus, Mars, and Lune (aka the Moon ...

Venus will pass between the Earth and sun on Saturday during what's called an inferior conjunction.. The moment of conjunction will happen at around 9 p.m. EDT, but don't plan on seeing the linkup.

A super-Earth on a highly eccentric orbit would also be especially bad news for the inner planets, because it would be more likely to push or pull Earth, Mars and Venus into eccentric or tilted ...

A super-Earth just beyond Mars would throw all the smaller rocky worlds of the inner solar system completely out of whack; the super-Earth's gravity would push and pull the other planets into ...