light

Smaller, Ground-Based Telescopes can Study Exoplanet Atmospheres too

The next step to understanding exoplanets is to understand their atmospheres better. Astronomers can determine a planet's mass, density, and…

3 months ago

How Far Does Light Travel in a Year?

Light travels at a speed of 299,792,458 m/s (1080 million km/h; 671 million mph), which works out to about 9,460.5…

5 years ago

Finite Light — Why We Always Look Back In Time

Light's finite speed make all gazing a ride in a time machine. Only a photon truly lives in the moment.

5 years ago

How Does Light Travel?

Since ancient times, scientists have debated the true nature of light. Despite the progress we've made, there are still mysteries…

6 years ago

Astronomy Cast Ep. 412: The Color of the Universe

What color is the Universe? Turns out this isn't a simple question, and one that scientists have really been unable…

6 years ago

Astronomy Cast Ep. 411: The Science of Sunset Colors

We all enjoy beautiful, multicolored sunsets. But what causes the brilliant oranges, pinks and purples that we see, and why…

6 years ago

Astronomy Cast Ep. 405: Method Not Found

Last week we talked about knowledge, what we do and don’t know. This week we talk about questions which are…

6 years ago

Astronomy Cast Ep. 398 – Seeing Things: Emitting, Reflecting, Ionizing Light Sources

Astronomers gather electromagnetic radiation with the telescopes: mostly visible light. But sometimes they've got to be clever about where they…

6 years ago

The Journey of Light, From the Stars to Your Eyes

This week, millions of people will turn their eyes to the skies in anticipation of the 2015 Perseid meteor shower. But what happens on less…

7 years ago

A Red Moon – NOT a Sign of the Apocalypse!

On most evenings, the Moon will appear as a bright yellow or white color in the night sky. But on…

7 years ago