Earth and Beyond

What does the Earth's gravity do?

• It pushes objects away from the Earth
• It makes the Earth spin
• It pulls objects towards the Earth
• It changes the color of the sky

Which of the following sets contain only objects that shine as a result of reflected light?

• Stars, Planets, Moons
• Sun, Stars, Comets
• Planets, Moons, Comets
• Stars, Sun, Galaxies

The mass of the Moon is six times lesser than the mass of the Earth. The gravitational pull on the Earth will be

• Six times stronger than on the Moon
• Six times weaker than on the Moon
• The same as on the Moon
• Twice as strong as on the Moon

Following factors affect the visibility of heavenly objects EXCEPT

• Atmospheric conditions
• Light pollution
• Distance from the object
• Color of the object

1. Why do you think planets do not collapse into the Sun?

• Because the Sun's gravity pulls them in
• Because they are moving in an orbit around the Sun
• Because they are too far from the Sun
• Because the Sun's heat keeps them away

Which statement about the force of gravity is False?

• Gravity is a force that attracts two objects toward each other
• The force of gravity decreases with distance
• Gravity is only present on Earth
• Gravity depends on the mass of the objects

The force that keeps the planets from collapsing into the sun is

• Gravitational Force
• Electromagnetic Force
• Nuclear Force
• Centrifugal Force

1. When a boy rotates a stone tied to a string by swirling the string, what force does his hand exert

   on the string?

• Gravitational force
• Frictional force
• Centripetal force
• Electromagnetic force

According to Kepler's Third Law, if two planets have the same semimajor axis (distance), which one will have a shorter orbital period?

• The one with the larger mass
• The one with the smaller mass
• They will have the same orbital period
• The one closer to the sun

According to Kepler's Second Law, a planet moves fastest in its orbit when it is:

• At its aphelion (Farthest from the Sun)

• At its perihelion (Closest to the Sun)

• Equidistant from the Sun at all times

• In a circular orbit