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36 Cards in this Set

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A rocky object that revolves around the sun
A. asteroid
B. meteoroid
C. meteor
A small piece of rock or metal that travels in space around the sun
A. asteroid
B. meteoroid
C. meteor
A bright streak of light that passes through the Earth's atmosphere
A. asteroid
B. meteoroid
C. meteor
A ball of ice, dust, and gases that travels through space and orbits the sun
A. comet
B. meteorite
C. asteroid
Meteor that reaches the earth's surface
A. comet
B. meteorite
C. asteroid
What kind of path do the plantets follow around the sun?
An oval path
What is the largest planet?
Jupiter
What is the smallest planet?
Pluto
Why are Uranus and Neptune alike?
Because they both have rings, are made of gases and are blue-green
What keeps the planets in orbit as they orbit the sun?
Gravity
Why do planets often look brighter than the stars?
Because the planets are closer to the Earth than the stars
How do astronomers measure distances in the solar system?
In astronomical units (AU)
What is an AU equal to?
93,000,000 miles
What is the closest object to the Earth in the solar system?
The moon
Where is the asteroid belt located?
Between Mars and Jupiter
How are meteoroids formed?
When asteroids collide or a comet breaks up
If a comet were moving away from the sun, where would its tail be?
On the side away from the sun
What would happen if the Earth did not receive any energy from the sun?
The Earth would become dark and cold
What causes tides on Earth?
The gravitational pull of the moon and sun
The distance light travels in one year
A. light year
B. constellation
C. galaxy
Stars that appear to be in a group when viewed from Earth
A. light year
B. constellation
C. galaxy
A group of billions of stars, dust, and gases in space held together by gravity
A. light year
B. constellation
C. galaxy
Why does the sun seem brighter than other stars?
Because the sun is much closer to Earth
How long does it take for light from the sun to reach the Earth?
8 minutes
What does a star's brightness depend on?
Its size, temperature, color, and distance from the Earth
Are astronomical units (AU) useful in measuring distance to the star, why or why not?
No, because the units are not big enough to measure long distances in space
What do astronomers use to measure distances to stars?
They use a light year, which is about 6 trillion miles
Name the order of the colors of the stars from the coolest to the hottest.
red, orange, yellow white, and blue
What galaxy is our solar system in?
The Milky Way galaxy
The bending of light as it passes from one material to another
A. refraction
B. reflection
The bouncing of light off a surface
A. refraction
B. reflection
What do telescopes do?
Make distant objects appear closer and clearer
How many kinds of telescopes are there that gather and focus light and what are there names?
2 kinds, reflecting and refracting telescopes
What do telescopes in space do?
They produce better images than those on Earth because space images do not have to pass through the atmosphere, which can blur the focus
Name a famous space telescope.
The Hubble Telescope
Science Flashcards
Unit C Chapter 4
Astronomy
Science Flashcards
Unit C Chapter 4
Astronomy