When comparing groups of stars, which group has relatively low
luminosities and temperatures?

What does a red shift in light from distant celestial objects indicate to a scientist on Earth?

The Universe is expanding.

Which star has the lowest surface temperature? Antares, with a spectral type of M1 (the furthest from O in OBAFGKM), has the lowest surface temperature.

Explanation:

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answer biscay bay;

answer conditional instability;