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Messier 54 (also known as M54 or NGC 6715) is a globular cluster in the constellation Sagittarius. It is about 87,000 light-years, translating into a true radius of 150 light-years across. It is one of the denser of the globulars.

Messier 54 (also known as M54 or NGC 6715) is a globular cluster in the constellation Sagittarius. It is about 87,000 light-years, translating into a true radius of 150 light-years across. It is one of the denser of the globulars.

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“Do not worry if you have built your castles in the air. They are where they should be. Now put the foundations under them.” Henry David Thoreau

The Northern Lights should be on everyone's bucket list! Plan your trip to Norway today.

The Northern Lights should be on everyone's bucket list! Plan your trip to Norway today.

Nik Wallenda walk across Niagara Falls. from Living on the edge: 30 extreme photos that will take your breath away

Living on the edge: 30 extreme photos that will take your breath away

Nik Wallenda walk across Niagara Falls. from Living on the edge: 30 extreme photos that will take your breath away

Lightning Spectra... taken during a thunderstorm over Paris, the forking lightning bolt heats surrounding air to between 36,000 and 54,000 degrees Fahrenheit, breaking apart air molecules into ionized plasma. The bright lines of the spectra reveals the presence of nitrogen and hydrogen in our atmosphere.

Lunar Halos, Septuple Rainbows and Iridescent Meat: Incredible Optics Photos

Lightning Spectra... taken during a thunderstorm over Paris, the forking lightning bolt heats surrounding air to between 36,000 and 54,000 degrees Fahrenheit, breaking apart air molecules into ionized plasma. The bright lines of the spectra reveals the presence of nitrogen and hydrogen in our atmosphere.

Superb aurora images

Superb aurora images

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