Astronomy

Mona Evans

Pluto is smaller than our Moon, but it's the biggest known dwarf planet. On the inner edge of the Kuiper Belt, the Sun is so far away it would look like a bright star from there. And Pluto can get so cold that its atmosphere freezes and falls to the ground.

Mona Evans

This quiz is about Mars and its fascination. Some people even want to live there. How many questions can you answer?

Mona Evans

Where do comets come from? The Oort Cloud is home to a trillion comets at the edge of the Solar System, nearly half way to the next star. Sometimes they get kicked out and sometimes they come to visit the inner Solar System.

Mona Evans

The Solar System's large moons tend towards the weird and wonderful, and Triton is no exception. It has ice volcanoes, a strange “cantaloupe terrain”, and crazy seasons. It's the only large moon to orbit in the wrong direction, so it didn't form near Neptune. But where did it come from?

Mona Evans

Some people think that Venus could be habitable. And perhaps you might daydream about being closer to the Sun when the long winter nights come, and the temperature drops. After all, "Earth's twin" should be a nice place, shouldn't it? Let's talk about that.

Mona Evans

Easter Island and a distant dwarf planet – what do they have in common? The answer is Makemake – the creator god in the Rapa Nui mythology of Easter Island. How did his name come to be given to a small frozen body seven billion kilometers (four billion miles) from the Sun?

Mona Evans

B is for Bok globule, a kind of dark nebula studied by Bart Bok. B is for Bayer who invented a handy system of star designations beginning with Greek letters. And B is for Baily's beads. You won't find them in a jewelry shop, but you might see them in a solar eclipse, as Francis Baily did.

Mona Evans

What was the Paris Meridian? The Full Meridian of Glory tells its story and the stories of those who surveyed it. It's a saga of love and betrayal, dedication and deprivation, heroism and pettiness, and sometimes death. Truth really is stranger than fiction.

Mona Evans

What was it like to be one-third of the Apollo 11 crew? Michael Collins, the man in the command module that didn't land on the Moon, tells a fascinating story of astronaut training and space travel.