How does the death of one very massive star give birth to perhaps hundreds of smaller ones soon thereafter?
What will be an ideal response?
The more massive the star, the faster it evolves, and less time it has to leave its stellar nursery and dense molecular cloud. When it explodes while still close to this dense region, its shock wave will trigger compression and collapse of many smaller protostars all at once.
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Two pairs of sunspots appear similar, but if one was observed in 1990, and the next in 2002, we would note what difference?
What will be an ideal response?
The masses of stars are generally in the range of 30 to 0.1 solar masses.
Answer the following statement true (T) or false (F)
An observer traveling with speed 0.5c moves directly toward a beacon emitting photons with speed c in her direction. The observer measure the speed approaching photons to be
(a) 0.25c (b) 0.5c (c) c (d) 1.5c
You would perceive a change in a visible light wave's amplitude as a change in its color
Indicate whether the statement is true or false