Sirius A And B Taken On 13th December 2005 By Hubble Space Telescope

Sirius A And B Taken On 13th December 2005 By Hubble Space Telescope

Sirius A and B taken on 13th December 2005 by Hubble Space Telescope

Sirius A is well known for being the brightest star in the night sky and a part of the constellation Canis Major. However, its binary partner, Sirius B was only discovered in 1862.

Ever since the creation of Newton’s law of universal gravitation, star mechanics became not only descriptive, but also predictive. Sirius A’s path across the night sky was unexpected. It wasn’t a straight line, but rather oscillated across its path. This caused many scientists to suspect that Sirius A had a binary partner.

Sirius B was first observed by Alvan Clark, who was testing a new telescope at the time. This was later on confirmed by other telescopes.

Sirius B is a white dwarf, while Sirius A is a main sequence star, meaning it is much larger and much brighter. 1000x brighter than Sirius B, in fact.

In the photo, Sirius A is in the center (although there are some effects due to the instruments) and Sirius B can be seen in the lower left.

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