Earth, shot from space, as it absorbs and reflects rays of light coming from the Sun - the same white-looking rays that give our sky its colour.
Some people think the sky is blue because of sunlight reflected off the ocean and back into the sky. But that's not the real reason.
Poul Henningsen’s Artichoke Lamp, viewed from below at London’s Park Plaza Hotel.
Doc Searls/Wikimedia Commons
We asked five design experts – what's your favorite product of all time, and why?
Photosynthesis can teach scientists a lot about solar technologies.
Individual light-harvesting protein complexes have a remarkable ability. Light, which is normally effectively harvested, is also used to finely control how much of it should be harvested.
Time to get up.
alarm clock image via www.shutterstock.com
Gaining a better sense of what genes are involved in regulating circadian clocks could put us on a path to find better treatments and therapies to help people adjust to time shifts.
What colour is your light?
The wrong kind of light can seriously impact your well-being.
Light from the universe’s first galaxies destroyed the hydrogen atoms that formed during the Big Bang.
NASA, ESA, R. Ellis (Caltech), and the UDF 2012 Team
A new telescope aims to figure out what became of the universe's original atoms once the first stars began to shine.
A visualisation of simulation data showing light successfully trapped at a standstill.
Freezing light in mid-air isn't just the realm of Star Wars, as new research shows. But what do you do with the light once it's trapped? One option is to use it to develop new forms of computers.
University of Bath
Flexible light-emitting screens mean you soon won't need bulbs because your wallpaper – or even your furniture – will light up at the flick of a switch.
World map of artificial sky brightness.
F. Falchi, et al. Science Advances (2016)
Eighty percent of North Americans can no longer see the Milky Way at night. But the problem with light pollution isn't just about stargazing.
Yoghurt. Nuts. Yes or no?
What's the deal with fat in our foods and drinks? Should we avoid it?
A new development could mean vastly increase data transfer over optical fibre cables.
The design of a new chip to detect the twisted nature of light waves could pave the way for next generation of optical communication technologies.
Drawing and reality: designing a metamaterial pattern. On the left is the plan; on the right is the actual object.
We are beginning to be able to control very precisely how light interacts with matter, creating opportunities for invisibility, soundproofing and even earthquake damage prevention.
A new technique could help the police identify more criminals from just their footprints.
Leif Erikson discovers America.
Christian Krogh/Wikimedia Commons
A bold theory suggests the Vikings may have used a mysterious method of studying sunlight to navigate the oceans.
Woman holding mug via www.shutterstock.com
It might be that teaching people to reframe their thoughts about winter can help them overcome seasonal affective disorder year after year.
The Dreamtime constellation of The Emu rises out of the glow of Sydney, 350km away from the Australian Astronomical Observatory.
Darkness is precious to astronomers, but it's also good for everybody. We should ensure we preserve the dark by using the latest technologies responsibly.
Hyperspace may one day be a reality.
Many people think relativity puts a hard speed limit on the universe, but it actually opens up the possibility of faster-than-light travel - if we can overcome some significant practical hurdles.
Disase carrying insects are attracted to light bulbs – a constraint of domestic solar energy.
Solar is a vital piece of the energy puzzle for Africa, but there is an insect problem that comes with the light from solar.
Not dark enough.
People in bed via www.shutterstock.com.
Is electricity making us sleep less? A new study on sleep in preindustrial societies suggests the answer is no. But it misses a big point: people in preindustrial societies spend more time in darkness than we do.
The electronic band STS9 is known for having intoxicating light shows accompany their live performances.
Why do certain songs and colors make us feel a certain way?