1The solar corona is millions of degrees hotter than the surface of the sun, a phenomenon that has puzzled scientists for decades.
2During the total solar eclipse, the corona was visible as a shimmering aura around the dark disk of the moon.
3The corona of the virus is composed of spike proteins that allow it to attach to and infect host cells.
4The corona of light around the comet's nucleus is thought to be composed of gas and dust particles that have been ejected from the comet's surface.
5In some species of bacteria, a corona of flagella can be seen surrounding the cell, allowing it to move and change direction.