You can be the first to discover the next Halley's Comet! Take a trip out of this world with "Eyewitness Astronomy" to discover the planets, stars and galaxies around us. Visit the moon, blast off to Mars or take a stroll around the Milky Way. It is great for project work.You can be the first to discover the next Halley's Comet! Take a trip out of this world with "Eyewitness Astronomy" to discover the planets, stars and galaxies around us. Visit the moon, blast off to Mars or take a stroll around the Milky Way. It is great for project work.