Which statement accurately describes the origin and expansion of the universe?
as the universe continues to expand, it gradually gets warmer.
galaxies that are farther away are moving away more slowly.
cosmic background radiation is leftover thermal energy from the big bang.
stars and galaxies formed almost immediately after the big bang occurred.

Two metal blocks that have slightly different temperatures are placed next to one another. after five minutes, they both have lower but equal temperatures. according to the law of conservation of energy, what  most likelyhappened? energy was created inside the blocks. energy was destroyed inside the blocks. energy was absorbed into the blocks from outside the system. energy was transferred from the warmer block to the cooler block.