Review

Which is the biggest

• Earth

• sun

• universe

• galaxy

What is the largest planet in our solar system?

• Earth

• Jupiter

• Mars

• Venus

Which star is at the center of our solar system?

• Earth

• Sun

• Moon

• Mars

Which planet is known as the red planet?

• Earth

• Venus

• Mars

• Mercury

Define a force

• A invisible strength that can or can´t touch

• a visible strength that stay in his house

• a falling apple

• a door moving

How is a gravitaional field made

• When a big object has a big mass

• the object goes round in orbit because the love it

• a point mass M at the origin produces the gravitational field g​=g​(r​)=−r3GM​r​, where r​ is the position relative to the origin and where r=∣r​∣

• i

What is the force that keeps the planets in orbit around the sun?

• Electromagnetic force

• Gravitational force

• Nuclear force

• Frictional force

What causes the tides on Earth?

• Gravitational pull of the moon

• Wind patterns

• Underwater earthquakes

• Solar flares