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Supernova Only one supernova has been detected in Messier 81.

At the time, it was the second brightest supernova observed in the 20th century.

All it takes is for a supernova to go off a few light years away, and we'll all be dead!

This indicates that one or more supernovae must have occurred near the location where the Sun formed.

The most recent supernova to be seen in the Milky Way galaxy was SN 1604, which was observed October 9, 1604.

It is also considered a nova, because at least three times in the 20th century it produced a bright outburst of energy.

This remnant was not seen earlier because in most wavelengths it is lost in the image of the Vela remnant.

In 1996, the ROSAT All Sky Survey discovered a new supernova remnant in this area of the sky RX J1713.7 3946.

The net luminosity decay rate is lower, at 0.0075 magnitudes per day for Type II P, compared to 0.012 magnitudes per day for Type II L.

Based on measurements of the expansion using Type Ia supernovae, measurements of temperature fluctuations in the cosmic microwave background, and measurements of the correlation function of galaxies, the universe has an estimated age of 13.798 0.037 billion years.

It's so dark that if you were to be looking at the nearest star to you, and that star were to explode as a supernova, and you were to be staring directly at it at the moment when its light reached you, you still wouldn't be able to see even a glimmer.

Gallery See also Whirlpool Galaxy References External links Astronomy Picture of the Day The Antennae Galaxies (10 22 1997) Astronomy Picture of the Day The Antennae (04 29 2011) Astronomy Picture of the Day The Antennae (02 12 2015) The Register Galactic prang fingered in star formation mystery ESA Hubble News Release ESA Hubble images of Antennae Galaxies Animations of galactic collision producing antennae structures Antennae Galaxies at Constellation Guide