about 27 thousand
by Kenny cheung
That is a rediculous answer.
The current Guide Star Catalogue (GSC-II) contains 945,592,683 stars out to magnitude 21. That's almost a billion.
Supernovas are the explosions of large stars in space.
Any element was discovered in 1985.
No, they are much smaller.
The Mars Rover was not discovered it was invented.
Ozone i.e. O3 was discovered by Charles Fabry. It was discovered in the year 1913.
SN is the beginning of the supernovas name, self explanatory because it stands for Super Nova. The 4 digit number is the year it was discovered. The letter at the end is what order it was discovered in. For example, SN 2012A is the first Supernova discovered in 2012. SN 2012L would be the 12th discovered in 2012. Lately it has become more common that double letters are needed, like SN 2012AA or AB with the ammount of supernovas we discover with new technology.
about 1 year tops
Supernovas are the explosions of large stars in space.
1
Supernovas have occured from about 500 million year after the big bang till the present, and will do so for billions of more years.
no
In the Milky Way, a supernova occurs about once every 50 years.
100,000
Stars do not create supernovas. Supernovas happen to stars. A supernova is when a star, bigger than our own sun, explodes due to the lack of gas they need.
Star Dust from supernovas is what makes technically 'everything' in the Universe.
They are not. A supernova is an explosion of a star. Blue stars usually end their lives in such explosions.
In space.