Reference Terms
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Red giant
A red giant is a large non-main sequence star of stellar classification K or M; so-named because of the reddish appearance of the cooler giant stars.
Note: The above text is excerpted from the Wikipedia article "Red giant", which has been released under the GNU Free Documentation License.
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Space & Time News
November 11, 2024
Nov. 4, 2024 Astronomers have discovered a supermassive black hole at the center of a galaxy just 1.5 billion years after the Big Bang that is consuming matter at a phenomenal rate -- over 40 times the theoretical limit. While short lived, this black hole's ...
Oct. 30, 2024 New research in our Milky Way has revealed a neutron star that rotates around its axis at an extremely high speed. It spins 716 times per second, making it one of the fastest-spinning objects ever ...
Oct. 30, 2024 It would take far longer than the lifespan of our universe for a typing monkey to randomly produce Shakespeare, a new study ...
Oct. 17, 2024 Astronomers observed ancient quasars that appear to be surprisingly alone in the early universe. The findings challenge physicists' understanding of how such luminous objects could have formed so early on in the universe, without a significant ...
Latest Headlines
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Nov. 11, 2024 Like the Earth, the Sun likely has swirling polar vortices, according to new research. But unlike on Earth, the formation and evolution of these vortices are driven by magnetic ...
Nov. 11, 2024 Why is the expansion of our Universe accelerating? Twenty-five years after its discovery, this phenomenon remains one of the greatest scientific mysteries. Solving it involves testing the fundamental ...
Nov. 7, 2024 Researchers have developed an innovative technique to search for black hole light echoes. Their novel method, which will make it easier for the mass and the spin of black holes to be measured, ...
Nov. 7, 2024 Readily available thermoelectric generators operating under modest temperature differences can power CO2 conversion, according to a proof-of-concept ...
Nov. 6, 2024 Gamma radiation can convert methane into a wide variety of products at room temperature, including hydrocarbons, oxygen-containing molecules, and amino acids, reports a research team. This type of ...
Nov. 6, 2024 Tiny grains from asteroid Ryugu are revealing clues to the magnetic forces that shaped the far reaches of the solar system over 4.6 billion years ago. The findings suggest the distal solar system ...
Nov. 6, 2024 Researchers have uncovered where FRBs are more likely to occur in the universe -- massive star-forming galaxies rather than low - mass ...
Nov. 4, 2024 A new study details how climate change transforms coastal wetlands in North Carolina from forest to marshland or even open water, and how satellite imagery may help better direct conservation efforts ...
Nov. 4, 2024 Stem cells grown in microgravity aboard the International Space Station (ISS) have unique qualities that could one day help accelerate new biotherapies and heal complex disease, researchers say. The ...
Nov. 4, 2024 The temperature of elementary particles has been observed in the radioactive glow following the collision of two neutron stars and the birth of a black hole. This has, for the first time, made it ...