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Introduction to Astronomy Astronomy is the study of the universe and the objects in it. The Universe is all the matter and energy that exists everywhere. The universe includes: o All stars and constellations, galaxies o o Planets, moons and satellites o o Asteroids o Plasma Star Constellations A constellation is a that forms a shape or pattern Constellations are used for one’s , , finding on land and at sea. These stars appear to from East to West across the celestial sphere. The stars appear to move across the sky in one night, but this is just an illusion due to . Rotation The apparent daily motion of celestial objects is due to Earth’s Rotation is the . of an object on its axis. Celestial objects are not actually moving from east to west across the sky, rather the earth is under them. Revolution Revolution is the of one celestial object another. The path along which an object travels during a revolution is called an Stars and Planets The solar system is made up of the . , and all the that travel around it. The planets are - we see them because light reflects off them (they don’t glow). The sun and stars - they are called . Observing Stars and Planets We can see , Mars, Jupiter, and Saturn without binoculars The brightest star we can see is . The Difference Between Planets and Stars Planets o Are – in our solar system o Are than most stars o Reflect light from the o Are usually or o Are usually made of or o Have a steady o Wander slowly through constellations Stars o Are very , past our solar system o Are usually than planets o Give off their light o Are very o Are made of temperature gases o Appear to o Move of a constellation