low-density gas
-
What are Cool Clouds?
Have you ever driven through fog? I’m going to guess, for the sake of this post, that you have. And if you haven’t…well, I think the image above should give you a pretty good idea of what it’s like. Low…
-
What is a Nebula Made of?
What you see here is the Trifid Nebula, a vast cloud of gas and dust in space. In my last post, we explored why it looks the way it does. We discovered that the pink hues of emission nebulae are caused…
-
Our Sun: The Corona
When we observe our sun’s corona, we discover something odd. It’s really, really hot. But…wait a second. How is that odd? Shouldn’t the sun be hot? Well…yes. It should, and it is. Its surface temperature is almost ten thousand degrees…
