Why can't we see past the cosmological horizon?

A) Beyond the cosmological horizon, we would be looking back to a time before the universe was born.
B) We do not have big enough telescopes.
C) The cosmological horizon is infinitely far away, and we can't see to infinity.
D) Every galaxy in the entire universe (not just the observable universe) exists within the cosmological horizon, so there's nothing to see beyond it.


A) Beyond the cosmological horizon, we would be looking back to a time before the universe was born.

Physics & Space Science

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When an ideal gas undergoes a slow isothermal expansion:

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A space satellite weighs 100,000 newtons on Earth. When orbiting at a height of 6000 km [one Earth-radius] above Earth, its weight is

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