This black hole is at least 4.5 times the mass of the Sun and at 7.6 times the mass of the Sun’s Sun-facing companion star.
Another great looking object is the Orion Nebula, pictured here with the constellation of Orion in the background.
The Orion Nebula also boasts a fantastic companion star.
A companion star for the Orion Nebula is Ophiuchus. Its closest approach to Earth is with the constellation of Orion, around the year 1637.
This star is seen with the naked eye in the south end of the constellation of Taurus, around 1642. The star is about 6500 light years distant from Earth.
At around 1630 - 1750, the star shines at 10 times the brightness of the brightest star in the sky, Alpha Centauri .
It is said that this pair of stars were born about 4.2 billion years ago around the same time that stars formed in the young universe. It is also said that this pair is an example of ‘inflation’ theory. (Inflation is the theory that the universe was created at one billion million times the speed of light.)
However this theory is still disputed, so we can’t be absolutely certain that these stars formed around the same time. We do know that these pairs were formed and that they are probably very similar to each other. The black hole in the middle of the pair is estimated to be around 1.7 Million times the mass of the black hole in the center of the giant star, which would make it one of the most massive stars that was born in the universe. In terms of stellar ages, it is also one of the youngest stars ever seen. It was only found around 7,800 light years away in 1995, which is roughly 10,000 years after the Big Bang. This makes a lifetime of approximately 6-8.5 billion years old.
Ophiuchus was in fact found with a radio telescope, in South Africa, at just 15 degrees above the southern horizon. It is the closest star to the Earth that is more than 6,800 light years distant from us. It is also the second brightest star in the night sky after the giant star at the center of the galaxy known as the Large Magellanic Cloud .