Effective Temperature

Learn how T Coronae Borealis, a recurrent nova known as the Blaze Star, will likely light up in the night sky later in 2025 after last doing so in 1946.

XX Trianguli, a bright K0-type giant star in a binary system located in the constellation of Triangulum, exhibits chaotic, non-periodic star spot behavior.

Barnard's Star, 6 light years away, is a red dwarf and the closest to our own after the triple-star Centauri system. There's a planet whirling around it, somewhat smaller than…

Astronomers have confirmed a small exoplanet orbiting Barnard's star, the closest single star to our sun. There are hints of at least 3 more planets as well. The post Barnard's Star has 1 planet, maybe more, at last! first appeared on EarthSky.

Could there be more?

At just six light-years from Earth, Barnard's star is close by and has long been of interest to researchers searching for exoplanets. Now, they've found one.

Most of the exoplanets we've discovered orbit red dwarf stars. This isn't because red dwarfs are somehow special, simply that they are common. About 75% of the stars in the Milky Way are red dwarfs, so you would expect red dwarf planets to be the most abundant. This also means that most habitable worlds are going to orbit these small, cool stars, and that has some significant consequences for our search for life.

Using NASA's Transiting Exoplanet Survey Satellite (TESS) and many other telescopes, two teams of astronomers have discovered a temperate, Earth-sized exoplanet orbiting a cool red dwarf called Gliese 12.

A nearby planet named Gliese 12 b has an estimated surface temperature of 42°C (108°F), making it a promising candidate for liquid water and maybe life

UC Riverside astrophysicist Stephen Kane had to double-check his calculations. He wasn't sure the planet he was studying could be as extreme as it seemed.

55 Cancri e is a super-Earth planet that appears composed of diamond-like carbon — now, thanks to the JWST, astronomers have found the world has "grown" a...

Short-term exposure to high outdoor temperatures may impair the immune system, rendering people more prone to infection and possibly accelerating heart disease progression.

Astronomers have found the smallest exoplanet yet with water vapor. GJ 9827 d is a hot steamy world. But is it rocky like Earth or a mini-Neptune? The post Astronomers find smallest exoplanet yet with water vapor first appeared on EarthSky.

Astronomers from NASA and the University of Washington have estimated total internal heating rates and depths to possible subsurface oceans for 17 planets that may be cold ocean planets.

A red dwarf star is smallest and coolest type of star known. They're also extremely common, making up around 60 to 70% of the stars in the Milky Way. The post What's a red dwarf? Only the most abundant Milky Way star first appeared on EarthSky.

The Hubble Space Telescope has recently confirmed that a nearby planet, which is diminutive by exoplanet standards, is 1.07 times the size of Earth.

The rocky exoplanet LTT 1445Ac, located about 22.5 light years away, has been observed transiting its star by the Hubble Space Telescope.

Have you ever wondered why there are no green stars in the night sky? Find out why stars are different colors.

The doomed class of stars named Wolf-Rayets produce mysterious pinwheel shapes

Astronomers report the discovery of a new massive brown dwarf using the Zwicky Transient Facility (ZTF). The newly detected object is about 80 times more massive than Jupiter and orbits a low-mass star. The finding was detailed in a paper published July 28 on the preprint server arXiv.