Guide to Space
What is a Sun Dog?
A sun dog is an atmospheric phenomenon where you can see additional bright patches in the sky on either side…
Green Flash Sunset
[/caption] Have you ever heard of a green flash sunset? You might think it's a myth, but this is a…
Chromosphere
[/caption] The Sun may look like just a mass of incandescent gas (plasma, really), but it's actually broken up into…
Cenozoic Era
The Cenozoic Era is one of the most exciting periods in Earth's history, geologically, climatically, and biologically. It is also…
What is the Surface of Jupiter Like?
Have you ever wondered what it might feel like to stand on Jupiter's surface? Well, there's a problem. Jupiter is…
Earth’s Mass
[/caption] The Earth's mass is 5.9736 x 1024 kg. That's a big number, so let's write it out in full:…
Tallest Mountains
[/caption] There are many tall mountains around the world as well as on other worlds. Mount Everest is the highest…
What is Absolute Temperature?
If you measure temperature relative to absolute zero, the temperature is an absolute temperature; absolute zero is 0. The most…
Exobiology
Exobiology (same thing as astrobiology) is about life in space (on other planets, and moons; in other solar systems): where…
Blood Moon
A blood moon is the first full moon after a harvest moon, which is the full moon closest to the…