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.

The pull of gravity decreases when the distance between two objects

• Increases

• Decreases

Gravity is affected by

• mass and distance

• shape and color

• volume and density

Which to things affect the strength of gravitational pull?

• Distance and Weight

• Heat and Density

• Mass and Distance

• Gas and Dust

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

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.

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.

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.

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

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