Challenge your mind with Lumosity, the #1 app with 50+ brain games for memory, math, vocabulary, and more. Start training today!

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⊙.

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). Luminosity is an absolute …

Stacia Datskovska, Footwear News, 23 Oct. 2025 The luminosity of this image is the result of the sun’s rays shining on the planet, where they’re either reflected or absorbed by materials on …

Lumosity is a leading brain training app, used by over 100 million people worldwide to play cognitive games that exercise memory, attention, problem-solving and more.

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

Log in to an existing account. Forgot your password? Reset it here.

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

Train your mind with Lumosity’s fun science-based brain games, played by over 100 million users worldwide. Lumosity is a leading brain training app with cognitive games and puzzles to …

Your mind matters. Sign up to train your brain for free. Start with our Fit Test!