Introduction to the Night Sky Spring 2007 Heart of the Valley Astronomers
Planets versus Stars Mars Arcturus Vega Uranus Planets appear as discs of light in a telescope. Stars look like smaller pinpoints.
How long would it take Voyager II… Neptune? 12 years Sirius? …to reach About 180,000 years
Planets are much closer Neptune = 2.8 billion miles How does this compare to a walk on Earth? The Corvallis Clinic Think about a walk from Wilson School to… versus Sirius – almost 19,000x farther than Neptune = 52 trillion miles The South Pole
Where do we get seasons? Solar energy From the tilt of Earth as it spins