Credit & Copyright: Juan Carlos Casado
Explanation:
Sirius is the brightest star in the night sky.
Sirius is visible on the far left
of the above photograph, to the left of the constellation of Orion and Comet Hale-Bopp.
Intrinsically,
Sirius is over 20 times brighter than our
Sun and over twice as massive.
As Sirius is
8.7 light years distant, it is not the closest star system -
the Alpha Centauri
system holds this distinction.
Sirius is called the Dog Star
because of its prominence in the constellation of Canis Majoris (Big Dog).
In 1862,
Sirius was discovered to be a binary
star system with a companion star,
Sirius
B, 10,000 times dimmer than the
bright primary, Sirius A.
Sirius B was the first white dwarf star
discovered, a type of star first understood by
Subrahmanyan Chandrasekhar in 1930.
While studying Sirius in 1718,
Edmond Halley discovered that stars move
with respect to each other.
There is conflicting evidence that
Sirius appeared more red only 2000 years ago.
1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 |
Январь Февраль Март Апрель Май Июнь Июль Август Сентябрь Октябрь Ноябрь Декабрь |
NASA Web Site Statements, Warnings, and Disclaimers
NASA Official: Jay Norris. Specific rights apply.
A service of: LHEA at NASA / GSFC
& Michigan Tech. U.
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Публикации с ключевыми словами:
кометы - звезды - белый карлик - Sirius - Сириус - star - комета Хейла-Боппа
Публикации со словами: кометы - звезды - белый карлик - Sirius - Сириус - star - комета Хейла-Боппа | |
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