Lesson 2: The Universe and the Solar Sytem
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There are how many inner planets in the solar system? What are they? a) 5 only - Mercury, Venus, Earth, Mars, and Jupiter b) 4 only - Mercury, Venus, Earth, and Mars c) 3 only - The first 3 planets from the sun are the only inner planets d) 2 only - Mercury and Venus
b) 4 only - Mercury, Venus, Earth, and Mars
The ______ is at the outer limb of the galaxy (not at the center).
Sun
A huge disc and spiral-shaped aggregation of about at least 100 billion stars and other bodies.
Milky Way Galaxy
Its spiral arms rotate around a globular cluster or bulge of many, many stars, at the center of which lies a supermassive blackhole.
Milky Way Galaxy
The Milky Way is part of what supercluster of galaxies?
Virgo Supercluster (Virgo SC) or the Local Supercluster (LSC or LS)
True or False: Much of the mass of the solar system is concentrated at the sun while angular momentum is held by the outer planets.
TRUE
What happens to the periods of revolution of the planets as the their distance from the sun increases?
It increases as the distance of the planets from the sun increases.
True or False: Not all planets revolve around the sun
FALSE
True or False: Outermost Planets move the fastest.
FALSE. Innermost planets move the fastest.
Inner planets are also called _______
Terrestrial Planets
What are the outer planets of the solar system?
Jupiter, Saturn, Uranus, and Neptune
True or False: All planets are located at regular intervals from the sun
TRUE
Orbits of the planets are ______ and are on the same plane.
Elliptical
Smaller than asteroids; though of as remnants of a “failed planet” - one that did not form due to disturbance of Jupiter’s gravity.
Meteoroids
What is the diameter of the Milky Way Galaxy?
100 Million Light Years
1 light year is equivalent to _________
9.4607 x 10^12 km
How many years does it take for the solar system to revolve around the galactic center?
240 million years
How old is the earth and the solar system?
4.6 billion years old
It lies beyond Neptune and comprise numerous rocky or icy bodies a few to hundreds of kilometers in size.
Kuiper Belt
1 AU is equal to
150 million km = Sun-Earth distance
It marks the outer boundary of the solar system and is composed mostly of icy bodies.
Oort Cloud
It lies between Mars and Jupiter.
Asteroid belt.
What are the Jovian planets?
Jupiter, Saturn, Uranus, and Neptune
Consider the following statement: “Rocky asteroids are found primarily in the asteroid belt and Kuiper belt while icy comets are found primarily in the Oort cloud.” What’s wrong with this statement? a) Comets are not really icy. b) Asteroids are not really made of rock. c) The Oort cloud has nothing to do with comets. d) The Kuiper belt contains icy comets, not rocky asteroids. e) The statement is accurate as written.
d) The Kuiper belt contains icy comets, not rocky asteroids.