Question

7 of 10
astronomers observe a distant star using a spectroscope to analyze the light that it emits.
the astronomers notice absorption patterns that match the spectral signatures of hydrogen and helium, as shown above. what does this most likely indicate about the star?
the star is very young and is made of all hydrogen
it is in the final stage of its life cycle
it is composed of only helium
hydrogen and helium are abundant in its atmosphere

Explanation:

Spectral signatures in a star's light indicate the elements present in its atmosphere. Absorption patterns for hydrogen and helium mean these elements are abundant there. A young star isn't just all hydrogen (stars have some helium from early fusion). If it were final - stage, other elements (from fusion stages) might show. And it's not only helium as hydrogen's pattern is also present.

Answer:

Hydrogen and helium are abundant in its atmosphere