An exotic colour at the far end of our visible spectrum and often associated with royalty, purple is relatively rare in nature. But some vibrant plants ... Only male purple emperors are purple - the ...

The dominating form of energy in the cosmos, dark energy is driving the accelerating expansion of the universe, but its nature remains a complete mystery. Dark energy is a hypothetical form of ...

But new evidence indicates that dark ... background and the observation of supernovae, indicate that dark energy’s effect is diminishing with time. “This is the biggest hint we have about the ...

The color purple is this month’s subject for the Reader’s Photo Challenge. It can range from a gentle lilac to a rich royal purple. Some readers found their colors in nature while others ...

Despite making up most of the matter in the universe, dark matter doesn't interact with light. So how do astronomers know it is there? In April 2023, scientists from the Atacama Cosmology ...

the nature of Dark Matter itself. When the foreground lensing object and the background lensed object -- both constituting individual galaxies in the illustration -- are closely aligned ...

They may be divided into two groups – purple sulfur bacteria ( Chromatiales) and purple non-sulfur bacteria ( Rhodospirillaceae). Purple bacteria are anoxygenic phototrophs widely spread in nature ...

Visit BBC Webwise for full instructions Last updated: 22 February 2011 The purple saxifrage is one of ... Apparently sailors out at sea used to see the dark clouds swirling up above the cliffs ...