test

Newton's second law of motion states that

• force = mass x acceleration.

• F = ma.

• P² = a³.

• for every action there is an equal but opposite reaction.

Newton's third law of motion can best be described as:

• what goes up must definitely - or eventually - come down.

• for every action there is an equal but opposite reaction.

• something that can only be explained using calculus.

• how & why rockets work in the airless vacuum of space.

Why do astronomers use light years as a measurement?

• because miles & kilometers are sufficient

• it's an easier way to describe huge distances

• it's an easier way to describe large objects such as stars

• because distances in space are extremely vast

What happened to Galileo after he published his findings in 1633?

• not much

• he was placed under house arrest

• he made a fortune and retired back to Pisa, Italy

• he was tried by the Inquisition and found guilty of heresy

The largest structure in the entire Universe is the

• Universe itself.

• Orion Nebula.

• Milky Way Galaxy.

• Virgo Supercluster.

Kepler's second law also states that a planet will speed up or slow down in its orbit.

• True

• False

Solstices occur when the Sun reaches the highest & lowest position in the sky. This occurs

• about once a year.

• around March 21st & Sept. 21st.

• very rarely.

• around June 21st & Dec. 21st.

_______ was the first to use a telescope to observe the heavens.

• Newton

• Kepler

• Copernicus

• Galileo

Kepler's third law states that the square of a planet’s orbital period equals one A.U. cubed or

• P³ = a².

• P² = a³.

• A.U. = astronomical unit.

• P³ = a³.

The __________ has planets, moons, comets, and asteroids.

• solar system
• earth
• rotation
• United States