Third Grade Astronomy

Why do scientists classify our sun as a star? Choose all that apply.

• it is a mass of fiery gas

• it gives off constant heat and light

• it twinkles in the sky

• it is a celestial object

How do scientists classify Earth?

• Scientists classify Earth as a sun.

• Scientists classify Earth as a rock.

• Scientists classify Earth as a planet.

• Scientists classify Earth as an asteroid.

Which characteristics help scientists classify planets such as Earth?

• a sphere in space with large mass that orbits around our star, the sun

• it is made mostly of rocks and gas

• clears most other objects from its path around the sun

• it does not make its own light

Describe all of the ways in which Earth moves in space.

• revolves around the sun in an elliptical orbit

• rotates, or spins, on its axis

• floats through the solar system with zero gravity

• as an eclipse

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What characteristic does NOT make Earth the perfect place for life on the planet?

• As the third planet from the sun, Earth gets the right amount of heat and light.

• The desert gets really hot in the summer and the arctic gets really cold in the winter.

• It has an atmosphere that protects life from harmful sunlight and helps hold heat to a steady temperature.

• It has water.

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Why does the sun appear to rise and set each day?

• There can be a solar and lunar eclipse.

• The seasons change.

• The sun goes around Earth.

• The Earth is spinning on its axis as it orbits the sun.

What is our solar system?

• planets

• the stars

• the sun and all of the objects in orbit around the sun

Tags

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What are the names of the four rocky inner planets?

• Mercury, Venus, Earth, Mars

• Jupiter, Saturn, Neptune, Uranus

What are the names of the four outer gas giants?

• Mercury, Venus, Earth, Mars

• Jupiter, Saturn, Neptune, Uranus

Where are Ceres and the asteroid belt located?

• between Mars and Jupiter

• between Earth and Mars

• Between Jupiter and Saturn