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Transcript
Our Universe Composed of planets, comets, starts, asteroids, moons and gases; our universe is infinite. The nearest start to Earth is 4.2 lightyears away. A light-year is the distance that light travels in one year. Stars www.west.net.~science Groups of stars are called constellations The absolute magnitude of a star is a measure of the amount of light it actually gives off and the light received on Earth is the apparent magnitued. The color of a start tells how hot or cold the temperature is. Comets Composed of dust and rock particles. Solar wind push the gases and dust away from the comet to make the tail. Comets begin to break up after passing the sun several times. www.astrosurf.com Meteors/Meteorites The small pieces of rock from comets moving through space are called meteoroids. A meteoroid that burns up in Earth’s atmosphere is called a meteor. A piece of a large meteoroid that does not burn up but hits Earth is called a meteorite. Asteroids A piece of rock made up of material similar to a planet. Most asteroids are between the orbits of Mars and Jupiter captured by gravity. Some asteroids are the moons of planets. Our universe is composed of many objects. A large group of stars, gas and dust are called a galaxy. The Milky Way galaxy is made up of about 200 billion starts. The universe is made up of an infinite number of galaxies. Comprehension Questions Groups of stars are called? What tells us how hot or cold a star’s temperature is? What happens to comets after they pass the sun several times? Most asteroids are between the orbits of what two planets? Cite References Google Images – www.west.net/~science – www.astrosurf.com – www.astrobio.net www.nasa.com
