Learn why researchers say artificial light at night might contribute to sleep disruption, metabolic disorders, and even mood ...

Researchers have cracked a fundamental optical challenge: how to control both angle and wavelength of light independently—a ...

But this doesn’t really make much sense when you think about it. After all, the Moon isn’t putting off any light itself.

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There are lots of good deals, but if you've got limited time, here are the ones you definitely don’t want to miss.

Debuts at Dior and Dries Van Noten didn't disappoint, while Willy Chavarria's political statement and use of color were key talking points of the season.

The best red light therapy devices can help reduce signs of aging at home. Here are the top dermatologist-approved and FDA-cleared ones to buy.

What might stick out is the distinct color on the fire hydrant's front steamer port: either light blue, green, orange or red. As you could've guessed, the colors mean something.

Metro extends automatic train operation to Blue, Orange and Silver lines The automatic train operation returned to the Red line in December of last year.

The moon appeared orange last night due to its low position in the sky, causing light to pass through more of Earth's atmosphere, scattering blue wavelengths. This event was part of a rare 'major ...

Blue and violet light is scattered more strongly than red and orange light—this is also why the sky looks blue during the day.

For example, red and orange light have longer wavelengths while blue and violet light have shorter wavelengths. Light also interacts with particles and gas molecules in the air and our atmosphere.