Author Question: What direct evidence do astronomers have that supports the heavy element formation in stars? A) ... (Read 29 times)

jman1234 · **on:** Jul 27, 2018

What direct evidence do astronomers have that supports the heavy element formation in stars?

A) The presence of technetium in giant star spectra
B) Observed elemental abundances
C) Gamma-ray emissions from decay of cobalt 56 in supernovae
D) Light curves of type-I supernovae
E) All of the above are evidence of this.

Question 2

Which of the following general statements about light and Earth's atmosphere is not true?

A) X-rays from the Sun are absorbed in the thermosphere.
B) Visible light from the Sun is absorbed in the exosphere.
C) Ultraviolet from the Sun is absorbed in the stratosphere.
D) Infrared light emitted by Earth itself is absorbed in the troposphere.