Unit 8: Solar System Review

Most of the asteroids in our solar system are located between the orbits of what two objects?

• The Sun and Earth

• Venus and Earth

• Mars and Jupiter

• Uranus and Neptune

The composition of the Sun is best described as

• liquid nitrogen and solid magnesium.

• molten rock, primarily iron.

• dense and composed of hot gases.

• lightweight particles of dust

Planets vary as they get farther from the Sun. As a rule, the farther a planet’s orbit from the Sun,

• the greater the planet’s diameter.

• the longer it takes to orbit the Sun.

• the rockier the surface of the planet.

• the greater the planet’s surface temperature.

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The path that planets take as they orbit the center of the solar system is a result of the interaction of what two things?

• The forward motion of the planet and gravitational pull of the Sun

• The mass of the planet and the composition of its atmosphere

• The magnetic field generated by the planet and friction with the air

• The age of the solar system and the radioactive decay of elements

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Why do planets orbit the Sun?

• The Sun is the only celestial object that has a gravitational pull

• The Sun’s chemical composition makes it attract planets

• Only celestial bodies that emit light, like the Sun, can be at the center of an orbit

• The Sun is the most massive object in our solar system, so it exerts the greatest gravitational pull

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Gravity can be defined as the

• force of attraction between two or more masses.

• friction created when two objects are in contact.

• energy given off by stars due to nuclear reactions.

• path an object follows as it moves through space.

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Which two factors affect the strength of the gravitational pull on two objects?

• Mass and density

• Weight and density

• Mass and distance

• Weight and distance

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Astronauts walking in space must wear space suits. The space suits provide all of the following EXCEPT

• oxygen

• gravity

• protection

• communication

Space probes are unmanned spacecraft that have helped scientists gather more detailed information about the universe and objects in our solar system. Space probes send back all of the following EXCEPT...

• A. soil and rocks from the surfaces of planets and moons.

• information about a planet’s surface and atmosphere.

• photographs of distant stars and space objects.

• data about the effects of solar winds on planets.

A tether is a rope-like device that attaches an astronaut to a space vehicle during the time spent outside on a spacewalk. Why is a tether necessary for a spacewalk?

• Strong solar winds would blow the astronaut away from the vehicle otherwise

• Astronauts must remain close to the vehicle to obtain the heat it provides

• Without a tether, astronauts would float away due to the lack of gravity in space

• Tethers add just enough weight to the astronaut to keep them in orbit

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