Question

which statements describe some of the original ideas proposed about the universe during the big bang? check all that apply. the universe exploded. the universe was opaque. the universe was one second old. the universe was very hot and dense. the universe expanded from a single point.

Explanation:

1. "The universe exploded": The Big Bang theory posits that the universe began with a massive explosion (expansion) from a singularity.
2. "The universe was opaque": In the early universe, before recombination, the universe was opaque because free electrons scattered photons, preventing light from traveling freely.
3. "The universe was very hot and dense": At the start of the Big Bang, the universe was extremely hot and dense, as all matter and energy were concentrated in a tiny space.
4. "The universe expanded from a single point": The Big Bang theory states that the universe originated from a singularity (a single point) and has been expanding ever since.
5. "The universe was one second old": The "one second old" is not an original idea of the Big Bang's initial state; the universe was much younger (like a fraction of a second) in its earliest moments, and the "one second" mark is part of its later evolution (e.g., when certain particle processes occurred), so this is not an original idea about the very start.

Answer:

• The universe exploded.
• The universe was opaque.
• The universe was very hot and dense.
• The universe expanded from a single point.