Post your favorite spatial phenomena

[Rÿcher]

Here's one of mine:

I could look at that forever.

 

[T J]

I've been in love with this one for a while.

 

[Haytil]

Here's one of mine:
...
I could look at that forever.

What's it called?

 

[Tan Ru]

This is my favorite:

 

[Rÿcher]

Here's one of mine:
...
I could look at that forever.

What's it called?

V838 Monocerotis

 

[Chris3123]

Not my favorite, but an honorable mention for sure:

 

[Outpost4]

Here's one of mine:
...
I could look at that forever.

What's it called?

V838 Monocerotis

And it's expanding:

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V838 Mons continues to expand. Here is a picture from September, 2006. The yellow star in this picture is the same as the red one in the other images. This picture has also been turned about 90° counter clockwise from the other images. Match up the white stars to the left of the central red star to get your bearings.

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As cool as V838 Mons is, and it is very cool, I'll take the good ol' Orion Nebula myself.

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[Outpost4]

I'll give you one more, this time as a link.

Freaking awesome time lapse movies of the Crab Nebula pulsar.