Ancient astronomers observed that some planets seemed to move backwards.

This is called retrograde motion.

Why was Pluto changed from planet to dwarf planet?

There are other dwarf planets bigger than Pluto.

Where are most asteroids found in the solar system?

In an orbit between Mars and Jupiter.

Why did Aristotle believe in a geocentric solar system?

It was correct based on what he observed.

Why did astronomers start to question the geocentric model?

Shooting stars moved in all directions and some hit the ground., Bright objects with glowing "tails" would appear and the disappear., New stars appeared and then disappeared.

What is the definition for a "moon"?

Moon's orbit around something else.

How does day and night depend on Earth's rotation?

The spinning side facing the Sun is day the the side away is night.

Why is the star Polaris called the "North Sar"?

The Earth's north pole points towards it.

How did Galileo's telescope help prove the heliocentric model was correct?

Details of planets and moons orbits could be seen.

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The Structure of the Solar System

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Question from HMH 8th grade Unit 3 Space Science.

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Answers

1
Ancient astronomers observed that some planets seemed to move backwards.
This is called constellation motion.
This is called retrograde motion.
This is called epicycle motion.
This is called transit motion.
2
Why was Pluto changed from planet to dwarf planet?
There are other dwarf planets bigger than Pluto.
It's not big enough to be a planet.
It's so far away no can see it anyway.
There was no room for another dwarf.
3
Where are most asteroids found in the solar system?
In the Keiper Belt.
In an orbit between Mars and Jupiter.
Randomly throughout the solar system.
Out beyond the Oort Cloud.
4
Why did Aristotle believe in a geocentric solar system?
It's what he learned at school.
It was the theory of Ptolemy.
He made it up as a joke and people believed him.
It was correct based on what he observed.
5
Why did astronomers start to question the geocentric model?
They could not do the math to figure it out.
Shooting stars moved in all directions and some hit the ground.
Bright objects with glowing "tails" would appear and the disappear.
New stars appeared and then disappeared.
6
What is the definition for a "moon"?
Moon's orbit around something else.
Moon's glow brightly at night.
Moon's are the same as dwarf planets.
Moon's are round like a ball.
7
How does day and night depend on Earth's rotation?
The North hemisphere is day and the south is night.
The Sun rises in the west and sets in the east.
The spinning side facing the Sun is day the the side away is night.
8
How long did the geocentric model of the Solar System last?
2000 years.
1500 years.
1000 years.
400 years.
9
Why is the star Polaris called the "North Sar"?
The Earth's south pole points towards it.
The big dipper constellation points to it.
It is always found at the top of a map of stars.
The Earth's north pole points towards it.
10
How did Galileo's telescope help prove the heliocentric model was correct?
It didn't. It was more of a toy for carnivals.
Details of planets and moons orbits could be seen.
You could spy on other scientists to steal their ideas.
It could measure the distance to the planets.

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