Phobos orbits Mars at a distance of 6,000 km above the Martian surface.
Note that it doesn't cover the entire Sun, unlike solar eclipses on Earth. That's because the exact coverage of our Moon over the Sun is an extremely rare thing for a planet to have -- a moon that's just the right size and distance to the angle made by the diameter and its distance almost exactly matches the same angle to its sun. It's quite uncanny, and won't last forever as the Moon is moving away from the Earth by 3.8 cm/year. The last total solar eclipse on Earth will be in about 600 million years.
So in fact, we live in a very special time and place, when and where we have total solar eclipses. Might be enough of a reason for aliens to consider us a tourist attraction.
--
Here's a video, via Mashable:
No comments:
Post a Comment