Guide to Space
Surface of Mercury
The surface of Mercury is marred by an impressive number of craters. The cratering is deeper than on most terrestrial…
Symbol for Pluto
The symbols of the planets, Moon and Sun are used in both astronomy and astrology. The symbol for Pluto is…
What Color is Mercury?
Unlike all of the other planets in the Solar System, Mercury is just bare rock. It does have a tenuous…
Discovery of Planet Mercury
Ancient people have known about the planets for millennia. It was only in the last few hundred years that new…
Pictures of Mercury
We can't just talk about Mercury. Sometimes you've just got to see it. Before NASA's MESSENGER spacecraft, there weren't a…
Surface of Pluto
When you imagine cold, icy Pluto, orbiting in the distant regions of the Solar System, you imagine snowy white ball.…
Who Was Pluto Named After?
You're thinking about a certain Disney dog, aren't you? Goofy's pet dog? Nope, it was actually named after Pluto, the…
Mass of Pluto
In everything but the largest telescopes, Pluto appears as a tiny dot. And determining mass from so little information is…
Temperature of Pluto
[/caption] With such a large distance from the Sun, Pluto is incredibly cold. But this temperature can vary enough to…
Distance to Pluto
Pluto has the most elliptical orbit of all the planets and dwarf planets. In addition to this widely varying orbital…