Our Solar System

How would the planets move if the Sun disappeared?

• The planet would stop moving because gravity is no longer affecting it.

• The planet would move for a little while longer, but then stop.

• The planet would move in a straight line in the direction it had been traveling, because of its inertia.

• The planet would stop moving, but then start moving again because it would attach to another celestial object or planet.

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The orbital speeds of planets closer to the Sun will be faster than planets farther away because.....

• The gravity decreases as the distance between the objects increase.

• The gravity increases as the distance between the objects decrease.

• The gravity increases as the mass of the object increases.

• The gravity between the objects decrease as the objects warm up.

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How do scientists believe gravity influenced the formation of the planets in our solar system?

• A large cloud of gas and dust ignited into a planet.

• Gravity pulled the planets out of the Sun.

• A large explosion created the planets.

• Large pieces of debris clumped together to form planets.

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What are the steps of the Nebular Theory?

• Step 1: A tiny point rapidly expanded

  Step 2: Helium was compressed into stars

  Step 3: The stars explode and turn into planets

• Step 1: Gravity pulled together atoms in a nebula

  Step 2: Nuclear fusion occurred and a star is born

  Step 3: Smaller clumps around the star formed into planets

• Step 1: The solar system formed because of the Big Bang

  Step 2: Our solar system was the first one

  Step 3: Dark energy is pushing other solar systems away

• Step 1: Gaseous planets will orbit the Sun slower

  Step 2: Rocky planets will orbit the Sun faster

  Step 3: The Sun will vaporize all the inner planets

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Which to things affect the strength of gravitational pull?

• Distance and Weight

• Heat and Density

• Mass and Distance

• Gas and Dust

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What causes the tides?

• The Moon and the Sun's gravity

• The Earth and the Sun's gravity

• Jupiter and Saturn's gravity

• The inner planets gravity

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What does the Earth, Moon and Saturn have in common?

• The Sun revolves around them.

• Saturn orbits the Earth, and at the same time, the Moon revolves around the Earth.

• They all revolve in elliptical orbital paths around the Sun due to gravity.

• They all have life on them.

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How does the Moon's gravity cause the rise and fall of Earth's ocean levels?

• The Sun's gravitational force "pulls" on both the Earth and the Moon at different times.

• Earth revolves on its axis, which causes ocean levels to rise facing the Moon.

• Since the Moon has more mass than Earth, the Moon's gravity causes tides.

• The Moon's gravitational force "pulls" on the oceans

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Gravity is affected by

• mass and distance

• shape and color

• volume and density

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The pull of gravity decreases when the distance between two objects

• Increases

• Decreases

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