Reference Terms
from Wikipedia, the free encyclopedia
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
September 7, 2024
Aug. 29, 2024 — Astronomers have spotted a pair of galaxies in the act of merging 12.8 billion years ago. The characteristics of these galaxies indicate that the merger will form a monster galaxy, one of the brightest types of objects in the ...
Aug. 28, 2024 — Supermassive black holes typically take billions of years to form. But the James Webb Space Telescope is finding them not that long after the Big Bang -- before they should have had time to form. ...
Aug. 27, 2024 — The James Webb Space Telescope has spotted six likely rogue worlds -- objects with planet-like masses but untethered from any star's gravity -- including the lightest ever identified with a dusty disk around it. The elusive objects offer new ...
Aug. 21, 2024 — Scientists studying the tracks of particles streaming from six billion collisions of atomic nuclei at the Relativistic Heavy Ion Collider (RHIC) -- an 'atom smasher' that recreates the conditions of the early universe -- have discovered a new kind ...
Latest Headlines
updated 12:56 pm ET
Sep. 6, 2024 — What is the shortest route to the next stop or the agreed meeting point? Global positioning systems (GPS) have become a routine part of everyday life for most people. Until now, however, the minimum ...
Sep. 5, 2024 — Drought is a widespread concern in the Western U.S., and water managers across the region are developing groundwater management plans to conserve the essential resource. Groundwater is often pumped ...
Sep. 6, 2024 — A team models the atmospheres of distant planets using neural ...
Sep. 6, 2024 — Researchers have discovered compelling evidence suggesting that the supermassive black hole at the center of our Milky Way galaxy, known as ...
Sep. 5, 2024 — A better understanding of the inner workings of neutron stars will lead to a greater knowledge of the dynamics that underpin the workings of the universe and also could help drive future technology. ...
Sep. 5, 2024 — A research team has discovered a small planet that displays peculiar orbital motion. The shimmying planet, located 455 light-years from Earth, shows ...
Sep. 4, 2024 — It's 7 billion years ago, and the universe's heyday of star formation is beginning to slow. What might our Milky Way galaxy have looked like at that time? Astronomers have found clues in the form of ...
Sep. 3, 2024 — Around 4 billion years ago, an asteroid hit the Jupiter moon Ganymede. Now, a researcher realized that the Solar System's biggest moon's axis has shifted as a result of the impact, which confirmed ...
Sep. 3, 2024 — Over billions of years, the universe's stars and galaxies shined their light into space, leaving behind an imperceptibly faint night light known as the cosmic optical background. NASA's New Horizons ...
Aug. 29, 2024 — To understand the mysteries surrounding black holes, researchers at Tohoku University have created a simulation of accretion disk turbulence that ...