Reference Terms
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Luminosity
In general physics, luminosity (more properly called luminance) is the density of luminous intensity in a given direction.
Note: The above text is excerpted from the Wikipedia article "Luminosity", which has been released under the GNU Free Documentation License.
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Space & Time News
April 20, 2025
Apr. 17, 2025 — Research from NASA's Curiosity rover has found evidence of a carbon cycle on ancient ...
Apr. 16, 2025 — Astronomers have detected the most promising signs yet of a possible biosignature outside the solar system, although they remain ...
Apr. 16, 2025 — Astronomers have found a planet that orbits at an angle of 90 degrees around a rare pair of peculiar stars. This is the first time we have strong evidence for one of these 'polar planets' orbiting a ...
Apr. 16, 2025 — A new study analyzing data from NASA's Perseverance rover has uncovered compelling evidence of multiple mineral-forming events just beneath the Martian surface -- findings that bring scientists one step closer to answering the profound question: Did ...
Latest Headlines
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Apr. 18, 2025 — Researchers have developed a new coronagraph that could make it possible to see distant exoplanets obscured by light from their parent ...
Apr. 18, 2025 — New research finds that despite large rivers and seas of liquid methane, Saturn's moon Titan seems mostly devoid of river deltas, raising new questions about the surface dynamics on this alien ...
Apr. 16, 2025 — A new study suggests the universe may rotate -- just extremely slowly. The finding could help solve one of astronomy's biggest ...
Apr. 16, 2025 — Why do comets and their meteoroid streams weave in and out of Earth's orbit and their orbits disperse over time? Researchers show that this is not due to the random pull of the planets, but rather ...
Apr. 16, 2025 — Researchers have helped overturn the popular theory that water on Earth originated from asteroids bombarding its surface; Scientists have analyzed a ...
Apr. 16, 2025 — An international team has discovered the most distant spiral galaxy candidate known to date. This ultra-massive system existed just one billion years after the Big Bang and already shows a remarkably ...
Apr. 16, 2025 — Scientists have designed a 'cosmic radio' detector which could discover dark matter in 15 ...
Apr. 15, 2025 — Observations of Jupiter show that ammonia is unevenly distributed in the upper atmosphere, against expectations of uniform mixing. Scientists found evidence for a complicated but apparently real ...
Apr. 15, 2025 — Extreme cosmic events such as colliding black holes or the explosions of stars can cause ripples in spacetime, so-called gravitational waves. Their discovery opened a new window into the universe. To ...
Apr. 15, 2025 — First ever supercomputer simulations of Mars with a fully molten core could explain the Red Planet's unusual magnetic field. Billions of years ago, Mars had an active magnetic field. Mysteriously, ...