Almost everyone is raised with the knowledge that the velocity of light in a vacuum is an absolute value of 299 792 kilometers (186 282 miles) per second. Even a single photon cannot surpass this ...

We learn about the planets, stars, and galaxies by their light ... Although they travel at the fastest possible speed (the speed of light,) they take a while to get here. The universe is big ...

Rayet star in the Cygnus X-3 system is speeding toward its destruction, torn apart by the powerful gravitational forces of ...

The cosmic couple Cygnus X-3 intrigues researchers. Located 32,000 light-years away, this system, composed of a compact ...

Year? A light-year is the distance light travels in one year. Light moves incredibly fast — about 186,000 miles (300,000 ...

So Al sets out on his own. Wanting him to get there as quickly as possible, his parents pay extra and send him at 99.99 percent the speed of light. The trip to the star and back takes 50 years.