Shining brightly in this Hubble image is our closest stellar neighbor: Proxima Centauri.
Proxima Centauri lies in the constellation of Centaurus (The
Centaur), just over four light-years from Earth. Although it looks
bright through the eye of Hubble, as you might expect from the nearest
star to the Solar System, Proxima Centauri is not visible to the naked
eye. Its average luminosity is very low, and it is quite small compared
to other stars, at only about an eighth of the mass of the sun.
However, on occasion, its brightness increases. Proxima is what is
known as a flare star," meaning that convection processes within the
star’s body make it prone to random and dramatic changes in brightness.
The convection processes not only trigger brilliant bursts of starlight
but, combined with other factors, mean that Proxima Centauri is in for a
very long life. Astronomers predict that this star will remain
middle-aged — or a "main sequence" star in astronomical terms — for
another four trillion years, some 300 times the age of the current
Universe.
These observations were taken using Hubble’s Wide Field and Planetary
Camera 2 (WFPC2). Proxima Centauri is actually part of a triple star
system — its two companions, Alpha Centauri A and B, lie out of frame.
Although by cosmic standards it is a close neighbor, Proxima Centauri
remains a point-like object even using Hubble’s eagle-eyed vision,
hinting at the vast scale of the Universe around us.
No comments:
Post a Comment