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Name ______________________________ Date ____________________ Welcome to the Milky Way Galaxy: Student Notes Galaxies • A galaxy is a “system of _________________________, together with dust and gas, held together by ______________________ attraction.” • There are 3 types of galaxies: Elliptical, Spiral, and Irregular • Elliptical galaxies are ______________ __________________ • Spiral galaxies have a spherical shape in the _________ with ________ _______________ out • Both Elliptical and Spiral galaxies have further classifications • Irregular galaxies have no ____________ shape to them • According to astronomers, their best estimate predicts there are at least ______ _____________ galaxies in the ___________________ universe. Milky Way Galaxy • This is an __________ conception of what the Milky Way Galaxy looks like. The artist based the picture on different photos taken by astronomers. • Why don’t we have any real pictures of the Milky Way Galaxy? • Where are we located in this picture? • We cannot photograph the Milky Way because it is so _________, and we are ___ ____. • The Milky Way Galaxy is estimated to be ____________ __________ _________. There are approximately 300 ____________ stars in our galaxy. • That means that it would take light (the fastest speed we know) 100,000 years to travel across the Galaxy. Copyright2015CrazyScienceLady • Our Sun, and entire Solar System is located within the Orion Arm of the Galaxy. We are a mere dot in our Galaxy. Sun Centered Model of the Solar System • Until the year _________, it was believed that the _________ was the center of our system. • Copernicus and Galileo studied Astronomy and both contributed to what we now know of our Solar System. • The ______ is the center of our Solar System. The moon orbits the Earth and the Earth and 7 other planets orbit the Sun. • Pluto was a planet for a long time, but is now no longer considered one. • Pluto is no longer considered a planet because of its _______, location in ___________, and tilt of _____________ in comparison with the other planets in our Solar System. Inner Planets • Mercury, Venus, Earth, and Mars are considered the ‘Inner Planets’ • Also known as “_______________ Planets,” which is misleading • Smaller • Either _____ or ________ moons • Made of mostly heavy __________, such as _________ and ___________ • ___________ Surfaces • _______ rings • Spin _____________ compared to outer planets • Orbit the Sun _____________ Copyright2015CrazyScienceLady Outer Planets • Jupiter, Saturn, Uranus, and Neptune • Also known as the “________ Giants” • __________ planets • ___________ moons • Made primarily of ____________ • ___________ have rings • Spin _______________ • Orbit sun _______________ Asteroid Belt • Separating the _________ and ___________ planets is an asteroid belt. Copyright2015CrazyScienceLady
