New models are often developed when old models fail to supply answers to important questions. Which of the following is a question answered by the heliocentric solar system model that could NOT be answered with a geocentric model? A. Why does the size of the Moon change during the month?

B. Why do Mercury and Venus always appear near the Sun?

C. Why does the Sun appear to move across the sky?

D. Why do the constellations change each season?

What was used as evidence to develop the big bang theory and the origin of the universe?

A. the existence of planets revolving around the Sun

B. the observation that galaxies are moving away from each other

C. the existence of planets revolving around stars other than the Sun

D. the observation that stars are still being produced in other galaxies

Scientists have documented that galaxies they observe seem to be moving farther away. Which concept best explains this?

A. black holes because an unseen force is pulling objects away from the center of the universe

B.

big bang theory because the universe exploded from a single point in space and is always expanding

C.

gravitational force because objects are being drawn toward the edges of the universe

D. solar system because the mass of the Sun pushes other galaxies away

Why is Earth capable of supporting life, unlike many other planets?

A. Earth's hydrosphere and atmosphere help maintain the conditions necessary to sustain life.

B. Earth has a gaseous atmosphere for only a part of the year.

C. Earth is a terrestrial body.

D. is located inside the asteroid belt.