When viewed through the two telescopes, the upper star appears four times brighter than the lower star.
What is the luminosity of star?
- A star's luminosity is the amount of light it emits from its surface. The apparent brightness of a star is how bright it appears to a detector on Earth. The distinction between luminosity and apparent brightness varies with distance.
- A quick glance at the night sky above Earth reveals that some stars are noticeably brighter than others. However, the brightness of a star is determined by its composition as well as its distance from the planet.
- Astronomers describe stars using two different magnitudes. The apparent magnitude of a star is its brightness as seen from Earth. The magnitude scale is based on perceived brightness.
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