expanding universe

How do Einstein's equations of general relativity describe space and time?

• As separate and independent entities.

• As an interconnected fabric for the universe.

• As a void that the universe expands into.

• As a static, unchanging background.

What observation led Edwin Hubble to conclude that the universe is expanding?

• Distant galaxies are moving closer to Earth.

• All galaxies are moving away from each other at the same speed.

• Far-away galaxies are receding, and the further they are, the faster they recede.

• The space between galaxies is shrinking.

What does the inflationary model describe in relation to the early universe?

• A period of slow, gradual expansion.

• A brief era of incredibly rapid expansion that led to the formation of gas clumps and galaxies.

• The collapse of matter into black holes.

• The unification of all fundamental forces into one superforce.

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Which of the following is a key difference between the "eternal inflation" and "brane" multiverse hypotheses mentioned?

• Eternal inflation suggests universes are static, while brane universes are dynamic.

• Eternal inflation implies isolated universes, while brane universes could interact by "bumping into each other."

• Brane universes are infinite, while eternal inflation universes are finite.

• Eternal inflation is a testable theory, while brane theory is not.