Guide to the Cosmos

Making the Wonders of our Universe
Accessible to Everyone

Robert L. Piccioni, Ph.D.

Celestial Images
page 2




Celestial Images
page 1
page 3
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Eagle Nebula
Eagle Nebula
seen in green in upper left,
spans over 200 trillion miles.


Pillars of Creation
"Pillars of Creation"
is a stellar nursery. Each pink dot
is a new star being born.



Cluster of new stars
in Small Magellanic Cloud,
a satellite galaxy of our Milky Way.


Star Sizes
Star Type Comparison
NASA chart comparing several
star types to our Sun, a yellow dwarf star.


Comparison of Celestial Object Sizes
The largest object in each group is the smallest
in the following group.


To start, let's compare our solar system, from Mercury to Earth



Here Earth is on the far left, with our largest planet Jupiter on the far right.


This image compares the sizes, from left to right, of: Jupiter, the largest planet in our Solar System; Wolf 359, a red dwarf star; our Sun, a yellow dwarf star; and Sirius, the brightest star in our sky.


In the this image, we see that Sirius is but a tiny dot at the left when compared with the progressively larger red giants Pollux, Arcturus, and Aldebaran.


Jumping to a vaster scale, Aldebaran is barely visible compared with: blue-white giant Rigel, which marks Orion’s right foot and is 40,000 times brighter than our Sun (if viewed from the same distance); red supergiant Betelgeuse, which marks Orion’s left shoulder; and an even larger red supergiant, Antares.


Finally, we get to the real monsters, comparing: Antares, blue hypergiant S Doradus, red supergiant KY Cygni; and the king of beasts, red supergiant VV Cephei, whose diameter is estimated to be over 1000 times that of our Sun. If placed at the center of our Solar System, VV Cephei would extend nearly to Jupiter; we’d be toast.

Celestial Images, page 1
Celestial Images, page 3