The big bang produced dark energy, which accounts for some of the energy needed to expand the universe.
The vastness of space may contain a type of matter known as “dark matter.”
The universe is currently expanding at an accelerating rate.
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Answer
given,


mass of book = 0.305 Kg
so, from the diagram attached below




computing horizontal component




θ = 62.35°
He should confront her about it and if after that point she continues report it to the chess team
No one expected violet & ultraviolet spectral lines to be shifted towards the red.