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What is a star’s luminosity?

X-rays that come from the vicinity of a black hole actually originate from

According to Einstein’s theory of general relativity, if one watches a clock from a distant location as it is moved closer to a source of gravity, one will see the clock

A star of apparent magnitude +2.1 appears _____ than a star of apparent magnitude –1.2.

Which of these statements is NOT an observation confirming the predictions of general relativity?

Why do astronomers seek to measure gravitational waves simultaneously with at least three detectors?

The next stage in the life of a star like the Sun, after the main-sequence phase, is

What is parallax?

What is the MOST important property of a star that governs its evolution and lifetime?

In 2017, astronomers observed the collision of two neutron stars