In SI units, luminosity is measured in joules per second, or watts. In astronomy, values for luminosity are often given in the terms of the luminosity of the Sun, L⊙.

Exercise Memory, Flexibility, and more with the world's most popular brain-training program. Discover What Your Mind Can Do with Lumosity.

Luminosity, in astronomy, the amount of light emitted by an object in a unit of time. The luminosity of the Sun is 3.846 × 1026 watts (or 3.846 × 1033 ergs per second).

When an orbiting planet crosses the Earth-facing side of its parent star, a bit of the light from the star is temporarily blocked, reducing overall luminosity by a tiny but detectable amount.

LUMINOSITY meaning: 1. the state of producing or reflecting bright light; the state of appearing to shine: 2. the…. Learn more.

Astronomy. the brightness of a star in comparison with that of the sun: the luminosity of Sirius expressed as 23 indicates an intrinsic brightness 23 times as great as that of the sun.

Aug 28, 2025 · Luminosity is the total energy emitted by a celestial object per unit of time from its surface. It radiates across the entire electromagnetic spectrum. Unlike apparent brightness, …