Question

1. which is a \big idea\ for space and time?

the universe consists of matter.
energy can be transferred but not destroyed.
the universe is very big and very old.
forces describe the motion of the universe.

Explanation:

• The statement "The universe consists of matter" is a general statement about the composition of the universe, not specifically about space and time.
• "Energy can be transferred but not destroyed" is related to the law of conservation of energy, not directly to space - time concepts.
• "Forces describe the motion of the universe" is more about the dynamics of objects in the universe (related to mechanics) rather than space - time.
• "The universe is very big and very old" directly relates to the concepts of space (big) and time (old).

Answer:

The universe is very big and very old.