Space Unit 4 REVIEW!

In approximately 5 billion years, the Sun will start to die. As it starts to die, the sun will expand, becoming much larger. The diagram shows the predicted changes in the habitable zone of the Sun as it changes. Why will the Earth no longer be in habitable zone of the Sun?

• Gravity will become stronger and water will become too heavy.

• The tides will become too large for organisms to survive.

• The Earth will become too hot to support life.

• The Sun's gravity will move Saturn's rings into the Earth's orbit.

Earth is the only planet in our solar system that supports life, such as humans, plants, and cats. Which conditions on Earth support life? Select TWO correct answers.

• presence of water

• a thin atmosphere

• above boiling temperatures

• distance from the Sun

• lack of carbon dioxide

Based on your knowledge of the solar system, complete the following statement . The force called ______ is what keeps all the planets in orbit around the Sun. The Earth is unique in its ability to support life because of its proximity to the Sun and because about 71% of its surface is covered by ______.

• gravity/water

• water/gravity

• tides/friction

Which characteristic of our solar system is most crucial to support life on Earth?

• the length of time of Earth’s revolution

• distance between the Earth and Sun

• the distance between the Sun and other stars

• the composition of Earth’s Moon

Earth is able to support organic life for many reasons, one of these being the composition of Earth’s atmosphere. Which answer correctly lists the composition of earth’s atmosphere?

• 79% Carbon Dioxide, 20% Oxygen, 1% Nitrogen

• 79% Nitrogen, 20% Oxygen, 1% other gases

• 79% Oxygen, 20% Nitrogen, 1% other gases

• 79% Oxygen, 20% Carbon Dioxide, 1% other gases

Which characteristic of earth is most responsible for its ability to support life?

• carbon dioxide present in the atmosphere

• earth is terrestrial

• proximity to the sun

• presence of ice

What does it mean for a planet to be found within the “habitable zone” of a solar system?

• A habitable planet is the correct distance from a star making the temperature conditions possible for supporting life.

• A habitable planet is the correct distance from a star making the water cycle possible.

• A habitable planet is too far away from a star making the temperature conditions too cold for liquid water to exist.

• A habitable planet is a planet where life has been discovered by scientists.

Based on the orbits of objects, which object would be affected the least by the gravitational pull of its star?

The objects closest to the star or the object farther from the star?

• closest

• farthest

The picture shows the Earth's orbit around the Sun and the Moon's orbit around Earth. Which of the following statements BEST describes the gravitational pull between these celestial objects? Select TWO correct answers.

• The gravitational pull of the Earth causes the Sun to orbit around it.

• The gravitational pull of the Sun causes the Earth to orbit around it.

• The gravitational pull of the Earth causes the Moon to orbit around it.

• The gravitational pull of the Moon causes the Earth to orbit around it.

• The gravitational pull of the Sun causes the Earth and Moon to orbit around it.

Doug ranked the following objects in order from most mass to least mass: Sun, Jupiter, Earth, Moon. Based on this information, which object has the most gravity?

• Sun

• Jupiter

• Earth

• Moon