A sun candle is a mesmerising, rare atmospheric phenomenon where sunlight reflects off ice crystals to create a flame-like beam below the sun.

California startup Reflect Orbital plans to launch thousands of satellites with mirrors to redirect sunlight to solar farms at night. Astronomers warn the bright reflected light could be “ruinous” to ...

Scientists for years have argued over drastic action to cool a warming world. Among the most widely debated is stratospheric aerosol injection, or SAI— injecting reflective particles into the upper ...

It seems wild, but there is a chance that reflecting sunlight back toward the sun could cool the Earth. The problem is, the mechanism would eat up huge amounts of space. Douglas A. McIntyre, Editor-in ...