Saturday, March 5, 2016
Curiosity is climbing! The first picture below is looking behind its track, and it's easy to see that Curiosity is gaining some altitude as it climbs up the slopes of Mt. Sharp. The second photo shows the Naukluft Plateau it's currently climbing up to.
So I did a little research, and found this table. From that table, I computed a few ratios of distances to planets to moon diameters:
So Charon really is unusually close to its planet. The next closest such ratio is that of our own moon, and it's seven times as large! If the moon was proportionally as far from Earth as Charon is from Pluto, it would be just 55,616 kilometers (33,370 miles) away. It would look huge in the sky – the full moon would span 3.6° in the sky, occupying 50 times the sky it does now. That what Charon would look like as seen from the surface of Pluto. Wow!