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→The stars
==The stars==
==The stars==
The two stars in the Sirius binary system orbit each other with an average distance of 19.8 AU (around the distance of [[Uranus]] from the Sun), which takes around 50 years to complete. Sirius A is a star of spectral type A1V. Sirius B is a [[white dwarf]] star, which were once a more massive main sequence star then its companion. Scientists estimate the age of the system is only some 230 million years old<ref name="SiriusAB">http://solstation.com/stars/sirius2.htm</ref>.
The two stars in the Sirius binary system orbit each other with an average distance of 19.8 AU (around the distance of [[Uranus]] from the Sun), which takes around 50 years to complete. Sirius A is a star of spectral type A1V. Sirius B is a [[white dwarf]] star, which were once a more massive main sequence star then its companion.
===Sirius A===
===Sirius A===
Sirius A is the star that is seen from Earth and known since ancient times, it is the brightest star in the night sky. As an A1V class star, it appears somewhat bluish in color. The star is estimated to be over 2 times Sol’s mass and 1.68 to 1.71 its diameter. Sirius is also much hotter with a surface temperature 9,940K, but the largest difference between the star and our sun is the luminosity, where Sirius is more than 21 times brighter. Because of extreme brightness and temperature, the star is expected only to last another billion years before leaving the main sequence and becoming a [[red giant]]<ref name="SiriusAB">http://solstation.com/stars/sirius2.htm</ref>.
Sirius A is the star that is seen from Earth and known since ancient times, it is the brightest star in the night sky. As an A1V class star, it appears somewhat bluish in color. The star is estimated to be over 2 times Sol’s mass and 1.68 to 1.71 its diameter. Sirius is also much hotter with a surface temperature 9,940K, but the largest difference between the star and our sun is the luminosity, where Sirius is more than 21 times brighter.
For an [[terrestrial planet|Earth-like]] world that has liquid [[water]] on its to exist around Sirius, it would need to be around 4.6 AUs away, equivalent to the distance of [[Jupiter]] from the Sun, with an orbital period of 6.8 years. However due to the close orbit of Sirius B, it would be difficult for a planet to form, due to the star's disruptive influence. If such a world did manage to form however, it also may be disrupted by the mass loss of Sirius B when it became a [[white dwarf]].
For an [[terrestrial planet|Earth-like]] world that has liquid [[water]] on its to exist around Sirius, it would need to be around 4.6 AUs away, equivalent to the distance of [[Jupiter]] from the Sun, with an orbital period of 6.8 years. However due to the close orbit of Sirius B, it would be difficult for a planet to form, due to the star's disruptive influence. If such a world did manage to form however, it also may be disrupted by the mass loss of Sirius B when it became a [[white dwarf]].