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Earth in the Solar System Study Guide
Terms in this set (25)
What are galaxies?
Galaxies are clusters of billions of stars, dust, and gas that are held together by gravity
What shape are galaxies?
Spiral, Elliptical, and Irregular
What is the name and shape of our galaxy?
Our galaxy is the Milky Way galaxy. It is a spiral galaxy
Our sun is what type of celestial body? (planet, moon, star, asteroid, comet)
Our sun is a star in the Milky Way galaxy. Our sun is one of the billions of stars in our galaxy.
Where is our sun (star) located in our galaxy?
Our solar system is 2/3 of the way out on one of the spiral arms.
How do stars differ?
Stars differ and can be classified by size, brightness, color, temperature, and age.
How does a star's temperature relate to its color?
The hottest stars are blue and the coolest stars are red.
What is the source of light for all bright objects in outer space?
How do the moon and planets shine if they don't make their own light?
They reflect sunlight
What causes different phases of the moon?
The phases are caused by the changing positions of the sun, Earth, and moon do that we see different parts of the sunlit half at different times of the lunar cycle
What is a solar eclipse and what causes it?
A solar eclipse means we do not see the sun because the moon is blocking our view. The moon is between Earth and the sun.
What is a lunar eclipse and what causes it?
A lunar eclipse means we do not see the moon because the Earth's shadow is on the moon. The Earth is between the sun and the moon.
What is an astronomical unit?
An astronomical unit is the average distance between the sun and Earth
What is an astronomical unit used for?
Astronomical units are used to measure distances within our solar system, such as the distances between planets. Light years are too big to use in our solar system.
What is a light year?
A light year is the very great distance that light travels in one year.
What is a light year used for?
Light years are used to measure the distances between stars and galaxies.
What makes up our solar (sun) system?
Our solar system is our sun and all the planets, asteroids, and comets that revolve around the sun.
What shape is the orbit of the planets, asteroids, and comets?
Elliptical. They travel in an ellipse.
Name the planets in our solar system in order, starting from the sun.
Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune.
What are the 4 inner planets called? How are they alike?
Mercury, Venus, Earth, and Mars are small, rocky planets.
What are the 4 outer planets called? How are they alike?
Jupiter, Saturn, Uranus, and Neptune are large and made of gas.
What are asteroids? (appearance, composition, position/location, size, motion/path)
Asteroids are small rocky bodies that revolve around the sun in the asteroid belt, between Mars and Jupiter
What are comets? (appearance, composition, position/location, size, motion/path)
Comets are made of ice, dust, and rock (dirty snowball).
Comets have tails that form when sunlight causes the comet's ice to change to gas.
Comets have long elliptical orbits that come from the Oort cloud or the Kuiper Belt, both beyond Neptune.
What causes day and night?
Day and night are caused by the rotation of Earth on its axis.
What causes the seasons?
We have seasons because Earth's axis is tilted as it revolves around the sun. So, in summer, that part of the Earth is tilted toward the sun and in winter, that part of the Earth is tilted away from the sun.
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