Reference Article

from Wikipedia, the free encyclopedia

Red supergiant star

Red supergiants are supergiant stars of spectral type K-M and a luminosity class of I.

They are the largest stars in the universe in terms of physical size, although they are not the most massive.

Stars with more than about 10 solar masses, after burning their hydrogen become red supergiants during their helium-burning phase.

These stars have very cool surface temperatures (3500-4500 K), and enormous radii.

The four largest known red supergiants in the Galaxy are Mu Cephei, KW Sagitarii, V354 Cephei, and KY Cygni, which all have radii about 1500 times that of the sun (about 7 astronomical units, or 7 times as far as the Earth is from the sun).

The radius of most red giants is between 200 and 800 times that of the sun, which is still enough to reach from the sun to Earth and beyond.

Note: This article excerpts material from the Wikipedia article "Red supergiant star", which is released under the GNU Free Documentation License.

See the following related content on ScienceDaily:


Related Videos

last updated on 2014-08-02 at 4:39 am EDT

NASA 360: Stories of the Solar System: Mars

NASA 360: Stories of the Solar System: Mars

NASA (July 12, 2013) Caleb: It turns out what we discover ends up leading us to new questions. Molly :The Mariner 4 mission was the first to take us to mars, and in doing so, changed everything we thought we knew about the red planet. Dr. Jim Garvin: There is this mystery of Mars. Mars is unavoidably special. Dr. Nicky Fox: The red planet, it's so often visible in the sky that, you know, you feel like it's just over there. Dr. Ralph McNutt: Mars has been subject of a lot of speculation for a long number of years.
Powered by NewsLook.com
India's Mars Mission: First Look at the Satellite That Will Orbit the Planet

India's Mars Mission: First Look at the Satellite That Will Orbit the Planet

NDTV (Sep. 11, 2013) The first images of India's small satellite for the red planet, Mars, have finally been released. If all goes well with the launch and the very risky and arduous, millions of kilometers long journey, India may rendezvous with the red planet. The mission will cost in the range of 600 crores.
Powered by NewsLook.com
First Anniversary of Mars Rover Landing

First Anniversary of Mars Rover Landing

AFP (Aug. 6, 2013) The first anniversary of the suspenseful "sky crane" landing of NASA's Mars rover Curiosity on the Red Planet is celebrated at the Jet Propulsion Laboratory (JPL) in Pasadena, California on August 5, 2013.
Powered by NewsLook.com
Brilliant Minds: Astrophysicist Jingnan Guo

Brilliant Minds: Astrophysicist Jingnan Guo

Deutsche Welle (July 14, 2013) Even when she was a child, Jingnan Guo was fascinated by space. Today the 28-year-old astrophysicist from China heads a research team at the German University of Kiel. Her team developed an instrument for the US research robot CURIOSITY to measure radiation levels on the surface of Mars for the very first time. That information will help us understand whether conditions on the Red Planet could one day be conducive to life. The 'Brilliant Minds' series on TOMORROW TODAY introduces young researchers from all over the world who have chosen to live and work in Germany.
Powered by NewsLook.com

Related Stories


Share This



Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:
from the past week

from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins