Unit 7
Where are most asteroids found?
Between the orbits of Mars and Jupiter
How does Jupiter's mass compare to the other planets?
It is more than twice the mass of all the other planets combined.
About how many Earths can fit inside the sun?
1.3 million
What is the term for swirling clouds of hydrogen gas out of which stars are born?
Nebula
Who played a crucial role in establishing the fields of extragalactic astronomy?
Edwin Hubble
What is a meteorite?
A chunk of space debris that has struck the ground.
What is the largest planet in the solar system?
Ganymede
What is the density of the Sun most similar to?
Jupiter
What type of star is in the state of hydrostatic equilibrium?
Main sequence star
What type of galaxy has stars and gas clouds concentrated mainly in one or more spiral arms?
Spiral Galaxy
What three things causes there to be less erosion on the Moon compared to Earth?
The Moon's lack of wind, water, and atmosphere
What are Saturn's rings made of?
Icy particles moving in orbit
How much of the Sun's incoming energy actually reaches the Earth's surface?
About 50% to 70%
What is the most common kind of star in the universe?
Red Dwarf stars
What type of galaxy is more three dimensional, without much structure, and it's stars are in somewhat random orbits around the center?
Elliptical galaxy
What has been found in the deep craters of Mercury?
Ice that never melts
What did the Voyager mission discover about Saturn?
It's rings are made of tens of thousands of narrow ringlets.
Where does the Sun's visible light come from?
The photosphere
What is the life span of a Yellow Dwarf star?
What galaxy has no particular shape?
Irregular galaxy
What created most craters on Venus?
Volcanic activity
William Herschel thought he had discovered a comet. What did he actually find?
The green disk of Uranus
When is the chromosphere's rosy red color apparent?
During eclipses
What type of star is our Sun?
Yellow Dwarf star
How are some irregular galaxies created?
When two galaxies collide