When you go outside on a clear, moonless night, you can see not only lots of stars but also the black space between them—literally space, in this case. Given that you can see stars and that the sky is ...

As someone who has spent thousands of hours observing the night sky, I like to think that I’m pretty familiar with it and able to navigate my way around with some ease. That’s certainly true on the ...

Earth's atmosphere scatters sunlight, making the sky appear blue due to shorter blue light waves. Longer waves, like red and yellow, dominate sunsets as light travels through more atmosphere. This ...

As the glow of artificial light has spread across the world, the number of places dark enough to see a sky rich with stars has shrunk. In North America and across Oregon, only a small percentage of ...