How is Olbers's paradox explained?
What will be an ideal response?
The Universe may be infinite in size, but it is neither infinitely old nor static. The essence of modern cosmologists' answer to Olbers's question was suggested first by Edgar Allan Poe in 1848 . Poe proposed that the night sky is dark because the Universe is not infinitely old but came into existence at some finite time in the past. The more distant stars are so far away that light from them has not yet reached Earth. That is, if you look far enough away, the look-back time approaches the age of the Universe, and you see to a time before the first stars began to shine. The night sky is dark because the Universe had a beginning.
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Solders are made from metals with a(n) _____________phase diagram, because alloys of the metals melt at a temperature lower than that of either of the two components individually.
Fill in the blank(s) with the appropriate word(s).
The Sun's magnetic field is highlighted by the visible arches of prominences
a. True b. False Indicate whether the statement is true or false
If we represent the Milky Way Galaxy as the size of a grapefruit (10-cm diameter), the distance to the Andromeda Galaxy would be about
A) 10 cm. B) 3 m. C) 30 m. D) 1 km. E) 100 km.
A(n) ______________ fault occurs as the result of compressional forces
Fill in the blank(s) with correct word