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SNC1D Name: _______________ Date: ________________ Unit 4 - The Study of the Universe In this unit we will be studying... 1. ...celestial objects such as the Sun, moon, and planets [Chapter 8] 2. ...celestial objects beyond our Solar System [Chapter 9] 3. ...space research & exploration [Chapter 10] *You are only responsible for the material covered in the sections listed below.* 8.1 - Touring The Night Sky What is astronomy? _______________________________________________________________ What is a celestial object? __________________________________________________________ What is the universe? _____________________________________________________________ Celestial Object: Definition: star Details: -Stars are luminous. What does that mean? -How large is our Sun compared to other stars? planet -Why can we see planets when they are non-luminous? -What is in our solar system? moon -What is an orbit? -The Earth's moon is non-luminous. Why does it "shine"? galaxy -What galaxy is our Solar System part of? **Do questions #1-9 on page 308** 8.3 - The Solar System: The Sun and the Planets Distances in the Solar System are measured in: _______________________________(AU). -The average distance from the Earth to the Sun is 1 AU (150 million km) What are the 4 inner planets and why are they called "terrestrial planets"? _______________________________________________________________________________ _______________________________________________________________________________ What are the 4 outer planets and why are they called "gas giants"? _______________________________________________________________________________ _______________________________________________________________________________ What is a dwarf planet and why is Pluto considered one? _______________________________________________________________________________ _______________________________________________________________________________ Smaller celestial objects: Characteristics: asteroids -How large are they? What shape are they? -Where are most asteroids found in our Solar System? meteoroids -What are they made of & how large are they? comets -When they enter Earth's atmosphere, they burn up, creating streaks of light called "shooting stars" or ________________. If they don't burn up completely they land on Earth as ________________. -What are they made of? -How long are the orbits of short-period comets (such as Halley's Comet)? -How long are the orbits of long-period comets (such as Hale-Bopp)? -Why can we see a tail on a comet? **Do questions #2,3,4,5,6,8,9 on page 316** 8.5 - Motions of Earth, the Moon, and Planets Model of the Solar System: What revolves around what? Who discovered it & when? geocentric model heliocentric model What causes planets & other celestial objects to orbit/revolve around the Sun, as well as moons around planets? _____________________________________ The Earth orbits (revolves) around the Sun once every __________ days. The Earth spins (rotates) around its axis once every __________ hours. The Moon orbits (revolves) around the Earth once every __________ days. The Moon spins (rotates) around its axis once every __________ days. **Do questions #1,2,3,5,7 (p.328)**