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Transcript
It’s a bird, it’s a plane… “Other stuff in the sky” Planets • Large bodies that orbit the stars or remnants of a star • Our solar system has 8 (+ Pluto and Charon) • Venus, Mars and Jupiter are all visible from earth at different times with the naked eye Planets vs. Dwarf Planets • Dwarf planets (like Pluto) exist in the far reaches of our solar system • Planets must be round, orbit the sun, and not be close to objects of similar mass • Pluto’s moon, Charon, is almost the same size, which disqualifies Pluto from Planethood Moons • Large bodies that orbit the planets, sometimes called natural satellites • The most familiar is earth’s solitary moon, but the gas giants can have several each Ellipse Asteroids • Asteroids are large chunks of metal and rock that are difficult to see with the eye • They do not form tails • They have elliptical orbits • Most orbit the sun in an area known as the asteroid belt (between Mars and Jupiter) in the same direction as the planets • They produce meteors when they enter the atmosphere Meteors • A meteor is the visible event when a lump of rock enters the earths atmosphere – Meteoroids just enter the atmosphere, burning up before they reach the surface – Meteorites are large enough that they strike the surface • The burn-up is caused by friction with the air. They’re also known as shooting stars. Comets • Comets are made up of ice and dust • They form tails when they pass through the inner solar system • They orbit the sun in large ellipses, and can go in the same or different directions as the planets. • They usually remain in the outermost regions of the solar system. Galaxies • A gravitationally bound system of stars, planets, dust and dark matter • They come in different shapes. The most common of these are spiral galaxies and elliptical galaxies.
