The Moon has no air, no sound, no weather and no liquid water. But you could see the Earth in the sky, shining more brightly than the Moon does from Earth. And since gravity is weaker, you could jump quite high and the footprint you left might last a million years.

The Milky Way is a giant spiral galaxy. Along with our neighboring giant Andromeda Galaxy, it dominates the Local Group of galaxies. But where are we in the Galaxy? Why do astronomers think that 95% of the Galaxy is mysterious dark matter? And what is lurking at the heart of the Milky Way?

We live in the Milky Way galaxy. When we look up at the sky all the stars we see are part of the Milky Way. But did you know that most of the Galaxy is made of mysterious, invisible dark matter and that there’s an even darker secret at its heart?

When August comes around, the best sky show of the year is also on its way. The Perseids are an annual meteor shower. What's it all about and how can you see it?

What's the difference between a meteor, a meteorite and a meteoroid? Is one of them the same as a shooting star? And what about asteroids and planetoids - which one is a minor planet? If any of these terms have puzzled you, here is a guide to help you out.

Does the Earth really wobble on its axis? How does the Sun make its heat? What would happen if I fell into a black hole? If you want to know the answers to these and many other questions, this book is a good collection of the things that people have asked "Merlin."

Now that Pluto is a dwarf planet, Mercury is the baby of the planets. It's close enough to the Sun for lead and zinc to melt during the day. Yet there may be frozen water in its deep craters. Until space probes came along Mercury was a mystery hidden in the Sun's glare, but that's changing!

Mars has no little green men, but it's a fascinating place. It has a mountain three times the height of Everest and a deep valley that dwarfs the Grand Canyon. Although Mars has no liquid water on the surface, if the southern polar icecap melted, it could cover the planet 36 feet deep in water.

Music of the spheres? Here’s a harp to play it on: Lyra, the harp of Orpheus that almost brought his beloved back from death. The constellation has one of the sky’s brightest stars, a star that is really four stars, and a colorful donut.

Imagine the horror: Something is eating the Moon, leaving its face covered in blood. This was how people once viewed lunar eclipses. Find out what actually causes a lunar eclipse, why the Moon may turn red during an eclipse, and where a lunar eclipse becomes a solar eclipse.