Imagine that it turns out that dark matter (not dark energy) is made up of an unstable form of matter and that all of it suddenly decays tomorrow into photons or other forms of energy. Based on current understanding, which of the following would begin to occur?
A) Stars would begin to stop having nuclear fusion in their cores.
B) Planetary systems would begin to expand and disperse.
C) The galaxies in clusters would begin to fly apart.
D) The expansion of the universe would begin coming to a halt.
C) The galaxies in clusters would begin to fly apart.
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a. a small-diameter telescope b. a large-diameter telescope c. A very small light collector d. None of the other choices are correct.
Spherical aberration can occur in
A) mirrors and lenses. B) mirrors but not lenses. C) lenses but not mirrors.
The meaning of the word "energy" is immediately clear to anyone
What will be an ideal response?