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Black hole
A black hole is a
concentration of mass great
enough that the force of
gravity prevents anything
from escaping it except
through quantum tunnelling
behaviour (known as Hawking
Radiation). The
... > full story
Quasar
A quasar is an astronomical
source of electromagnetic
energy, including light,
which shows a very high
redshift. The scientific
consensus is that this high
redshift is the result of
Hubble's law. This implies
... > 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
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
... > full story
Browse Reference Articles
1 to 10 of 195 articles
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Stellar evolution
In astronomy, stellar evolution is the sequence of changes that a star undergoes during its lifetime; the hundreds of thousands, millions or billions of years during which it emits light and heat. ... > more -
Holographic principle
The holographic principle is a property of quantum gravity theories which resolves the black hole information paradox within string theory. First proposed by Gerard 't Hooft, it was given a precise ... > more -
Introduction to general relativity
General relativity (GR) is the geometrical theory of gravitation published by Albert Einstein in 1916. It unifies Einstein's earlier special relativity with Sir Isaac Newton's law of universal ... > more -
Gravitation
Gravity is a force of attraction that acts between bodies that have mass. Gravity is the reason for the very existence of the earth, the sun and other celestial bodies; without it matter would not ... > more -
General relativity
General relativity (GR) is the geometrical theory of gravitation published by Albert Einstein in 1915. It unifies special relativity and Sir Isaac Newton's law of universal gravitation with the ... > more -
Gravitational wave
In physics, in terms of a metric theory of gravitation, a gravitational wave is a fluctuation in the curvature of space-time which propagates as a wave, traveling outward from a moving object or ... > more -
Gamma ray burst
Gamma-ray bursts are the most luminous physical phenomena in the universe known to the field of astronomy. They consist of flashes of gamma rays that last from seconds to hours, the longer ones being ... > more -
Particle accelerator
A particle accelerator is a device that uses electric fields to propel electrically charged particles to high speeds and magnetic fields to contain them. An ordinary CRT televison set is a simple ... > more
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