A 'false dusk' will be visible during twilight in February, but only from locations that are free of light pollution. Here's ...

How can we measure visible light? The electromagnetic spectrum includes all forms of light energy, known as electromagnetic radiation. (1) Different types of electromagnetic radiation such as radio ...

We learn about the planets, stars, and galaxies by their light—visible light, and also shorter-wavelength ultraviolet and longer-wavelength infrared light, invisible to the eye but detectable by ...

There are three primary colours of light, which can be combined to make secondary colours. A rainbow contains all the colours of the visible spectrum. It is often possible to see a secondary bow ...

As the U.S. continues to wait for newer sunscreen ingredients, patients should use tinted sunscreens to protect against visible light that causes photodamage, melasma and hyperpigmentation, according ...

After almost three years, Rice University scientist Yifan Zhu and colleagues have developed a new HPNC that is effective at killing bacteria in a biofluid under visible light without experiencing ...

The northern lights may be visible in portions of Wisconsin on Friday and Saturday nights, according to the NOAA's Space ...

AMONG workers in the field of mammalian embryo culture the suspicion has existed that ova exposed to visible light lose some of their capacity for cleavage. In the interest of clarification the ...