Save
Email
Print
Share
RSSSupergiant
Supergiants are the most
massive stars. Supergiants
can have masses from 10 to
70 solar masses and
brightness from 30,000 up to
hundreds of thousands times
the solar luminosity. They
vary greatly in radii,
... > full story
Light-year
A light-year or lightyear
(symbol: ly) is a unit of
measurement of length,
specifically the distance
light travels in a vacuum in
one year. While there is no
authoritative decision on
which year is used, the
... > full story
Astrophysics
Astrophysics is the branch
of astronomy that deals with
the physics of the universe,
including the physical
properties (luminosity,
density, temperature and
chemical composition) of
astronomical objects such as
... > full story
Spitzer Space Telescope
Spitzer Space Telescope
(formerly the Space Infrared
Telescope Facility [SIRTF])
is an infrared space
observatory, the fourth and
final of NASA's Great
Observatories. The first
... > full story
Browse Reference Articles
1 to 10 of 196 articles
-
Star cluster
Star clusters are groups of stars which are gravitationally bound. Two distinct types of star cluster can be distinguished: globular clusters are tight groups of hundreds of thousands of very old ... > more -
Space observatory
A space observatory is any instrument in outer space which is used for observation of distant planets, galaxies, and other outer space objects. A large number of observatories have been launched into ... > more -
Chandra X-ray Observatory
Chandra X-ray Observatory is a satellite launched on STS-93 by NASA on July 23, 1999. It was named in honor of Indian-American physicist Subrahmanyan Chandrasekhar who is known for determining the ... > more -
Astrobiology
Astrobiology is the study of life in space, combining aspects of astronomy, biology and geology. It is focused primarily on the study of the origin, distribution and evolution of ... > more -
Comet Hale-Bopp
Comet Hale-Bopp was probably the most widely observed comet of the 20th century, and one of the brightest seen for many decades. It was visible to the naked eye for a record 18 months, twice as long ... > more -
Radio telescope
A radio telescope is a form of radio receiver used in astronomy. In contrast to an "ordinary" telescope, which receives visible light, a radio telescope "sees" radio waves emitted by radio sources, ... > more -
Asteroid belt
The asteroid belt is a region of the solar system falling roughly between the planets Mars and Jupiter where the greatest concentration of asteroid orbits can be found. Despite popular imagery, the ... > more
Search ScienceDaily
Number of stories in archives: 140,674
more 
