To travel around an object is to ________________.
axis
rotate
revolve
The path an object follows as it revolves is called its _______________.
orbit
rotations
axis
The imaginary (or real) line an object spins around is called its _______.
pole
axis
seasons
Earth's axis is _________.
straight up and down
tilted
sideways
Earth's seasons are caused by what?
rotation and revolutions
revolution and the Earth's axis
the Earth's axis and rotation
The Earth revolves around the ____.
moon
sun
asteroid belt
The Moon revolves around the ___.
Earth
Sun
Asteroid belt
Which is the largest?
Earth
Moon
Sun
Which is the smallest?
Earth
Moon
Sun
What is the phase of the moon when it looks like a big circle in the sky?
new
full
gibbous
What is the phase of the moon called when it is almost full?
gibbous
crescent
new
What is the phase of them moon called when we can't see it at all?
crescent
full
new
What is the phase of the moon called when we just see a little sliver?
full
crescent
gibbous
In ancient times, scientists relied on what they could observe. Aristotle, an ancient Greek astronomer, saw the motion of the Moon, Sun, and Stars. He concluded that ___.
the Earth was the center of the universe
the Sun was the center of the universe
the Moon was the center of the universe
Ptolemy was an ancient Egyptian astronomer who also believed in an Earth-centered model. This meant the Earth was round and unmoving as the Sun and other heavenly bodies ___.
rotated around it
revolved around it
stood still
Copernicus, a Polish astronomer, had a new theory. As a scientist, he hypothesized that ____ was the center of the solar system and that the Earth and other planets revolved around it.
the Sun
the Moon
the Asteroid Belt
Galileo, an Italian astronomer, developed and improved the telescope. He was able to see, for the first time, clear evidence that the _____ was correct.
Earth-centered model
Sun-centered model
Moon-centered model
The distance between which of these is the shortest?
Earth & Sun
Earth & Moon
Moon & Sun
The United States Apollo Space Program to put a man on the moon was run by ___.
IASA
PSAT
NASA
July 20, 1969, astronauts Neil Armstrong and Edwin "Buzz" Aldrin were the ____ people to walk on the moon.
first
second
last
Astronauts brought back moon ____ to help scientists here on Earth study the moon's composition.