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	Frequently Asked Questions FAQs about Earth, Moon, and the Sun • Why do we always see the same side of the Moon from Earth? • Why does the Moon have phases? • What is the difference between a solstice and an equinox? • What is the chance of Earth being hit by a comet or asteroid? • How was the size of Earth first measured? • How fast is Earth moving through space? • What causes the Northern and Southern Lights? • When is the "Harvest Moon"? • Why does the Moon look bigger at the horizon? • What are sunspots? • Can solar flares and sunspots affect Earth? • What causes tides? • Did an asteroid really kill the dinosaurs? • What is the Moon made of? • Why is the Moon covered with craters? • Why is the distance between Earth and Moon increasing? Other FAQs Select FAQ category Earth, Moon, and the Sun The Solar System Space Probes and Human Exploration Stars and Nebulae Astronomers and Observatories Galaxies and Cosmology Stargazing and Star Lore » FAQs about StarDate Online
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