HFG1 features a prominent bluish arc-shaped shock wave, known as a bow shock ... The other small bright bluish ball visible to the left of center in the image is known as Abell 6.

Classical physics theories suggest that when two or more electromagnetic waves interfere destructively (i.e., with their electric fields canceling each other out), they cannot interact with matter.

Look at this stunning electric blue bioluminescent plankton caught on camera off the Welsh coast. Filmed by Andrew Rees at Dunraven Bay, Vale of Glamorgan, bioluminescence is light emitted by ...

Native to the rainforests of Mexico, Central America and South America, this bright blue butterfly has a short but stunning ... These scales are made up of several thin layers that reflect light waves ...