Shortly after the Big Bang, the chemical composition of the universe was
A) almost entirely hydrogen and helium.
B) hydrogen only.
C) about equal amounts of all the elements.
D) about the same as it is today.
A) almost entirely hydrogen and helium.
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North-zenith-south line which divides the sky into two halves
Why is it difficult to observe an exoplanet directly through a telescope?
A. It is hard to see exoplanets against the blackness of space. B. Exoplanets are small compared to their parent star, so they reflect only a small portion of the star's light. C. Exoplanets tend to be far away from their parent stars, making it hard to get both the star and the exoplanet in the telescope's field of view. D. Exoplanet atmospheres absorb too much light
As a rotating gas cloud contracts, it spins faster
Indicate whether the statement is true or false
A photosphere appears on a protostar near the end of stage
A) 1. B) 2. C) 3. D) 6. E) 7.