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Solar System
Planets I
Planets II
Sun & Stars I
Sun & Stars II
100
The model of the Solar System that has the Earth at the center is known as the?
Geocentric
100
Name the four inner planets
Mercury, Venus, Earth, Mars
100
Name the outer planets
Jupiter, Saturn, Uranus, Neptune
100
What will happen to the amounts of hydrogen and helium in the sun over the next few billion years?
Hydrogen will decrease and the helium will increase
100
What percent of stars are in the main sequence?
90%
200
The material that formed the solar system originated from a Solar ______________.
Nebula
200
The length of a planet's day is determined by its _____________ ____ _____________.
period of rotation
200
The characteristic of the gas giants that decreases with increasing distance from the Sun is
Equatorial diameter & number of moons
200
For the sun to be stable, the inward and outward forces in the sun must be?
in equilibium
200
The spinning neutron star that emits radio waves is called a ?
pulsar
300
The ____________ belt contains perhaps tens of thousands of objects orbiting within about 100AU of the Sun
Kuiper
300
What formed the Moon's maria?
lunar lava flows
300
All the planets of the solar system have moons except which two planets?
Mercury & Venus
300
The parallax of a star is observed because of what reason?
The observer moves
300
Nuclear fusion in the sun takes place in which area of the Sun?
core
400
Icy objects that mostly travel in long, elliptical orbits around the Sun are called?
comets
400
What is the difference between a full moon and a new moon?
Full Moon - side of the moon facing the Earth lit by the Sun. New Moon - Moon is between the sun and the Earth, dark side faces the Earth.
400
What are the two forces that explain why a planet stays in orbit?
inertia & gravity
400
The apparent brightness of a star will vary due to the
position of where the star is viewed
400
Which two factors cause a nebula to become a star?
gravity and heat
500
The large, irregular objects mostly located between Mars 7 Jupiter are called
Asteroids
500
How did the Earth's moon form?
An object struck the Earth and the pieces that broke off condensed and formed the Moon.
500
The moon lacks an ___________________, which explains that any water would have evaporated into space long ago.
Atmosphere
500
On the H-R diagram, the hot bright stars are located in which section?
The upper left
500
On the H-R diagram, if two stars are the same type how can you tell which star is located closer to the Earth?
If both stars are the same, the star that appears dimmer is further away.