All posts by Justin Avery

Justin spends most of his time creating notebooks about space, and far too little time maintaining this site.

NGC 1360: The Robin’s Egg Nebula

Usually when you see large pockets of nebula cloud it is associated with the birth of a new star. In this case the cloud in the image takes up around 3 light-years and is the remnants of the final stages...

/ August 6, 2018

Total Solar Eclipse Corona in HDF

For anyone that is fortunate to be at the right place during a solar eclipse they state it as one of the most amazing experiences in their entire life. Many resolve to say they will travel anywhere in the world...

/ August 2, 2018

The Observable Universe

How far can you see? Everything you can see, and everything you could possibly see, right now, assuming your eyes could detect all types of radiations around you — is the observable universe. In visible light, the farthest we can...

/ July 31, 2018

Saturns Hyperion in Natural Color

Like a giant pummel stone for cleaning dead skin from the from the feet of the Gods, Hyperion is an amazing moon that is orbiting around Saturn. The Cassini spacecraft swooped past for a look in 2005 and 2010 and...

/ July 31, 2018
Hubble Telescope Image Westerlund

The Massive Stars in Westerlund 1

Our Sun is pretty damn big — so big in fact that it has a volume of 1.3 million Earths — but our Sun has nothing on the largest Star inside the star cluster Westerlund 1. The biggest star inside...

/ June 20, 2017

How do you date objects?

How do you date objects?   How do you date Meteorites   Decay Constant We’ve done half-life as a way of understanding radioactive decay Another way is the use of the term, Gamma It’s done in the units of yr-1...

/ February 21, 2017

NGC 6357: Stellar Wonderland

For reasons unknown, NGC 6357 is forming some of the most massive stars ever discovered. This complex wonderland of star formation consists of numerous filaments of dust and gas surrounding huge cavities of massive star clusters. The intricate patterns are...

/ December 27, 2016

The Magnificent Horsehead Nebula

Sculpted by stellar winds and radiation, a magnificent interstellar dust cloud by chance has assumed this recognizable shape. Fittingly named the Horsehead Nebula, it is some 1,500 light-years distant, embedded in the vast Orion cloud complex. About five light-years “tall”,...

/ December 26, 2016

Sharpless 308: Star Bubble

Blown by fast winds from a hot, massive star, this cosmic bubble is huge. Cataloged as Sharpless 2-308 it lies some 5,200 light-years away toward the constellation of the Big Dog (Canis Major) and covers slightly more of the sky...

/ December 21, 2016

The Cartwheel Galaxy from Hubble

To some, it looks like the wheel of a cart. In fact, because of its outward oval appearance, the presence of a central galaxy, and their connection with what looks like the spokes of a wheel, the galaxy on the...

/ December 19, 2016