Light speed is the ultimate speed in our universe. Why we haven't been able to build - or even conceive of - a contraption that goes faster than light.
Brown dwarfs straddle the line between stars and planets. This one caught researchers' attention for its extremely red appearance. Turns out its atmosphere is laden with dust.
Modern interpretations of the historical data indicate that Polaris could be as much as 4.6 times brighter than it appeared to some of the earliest astronomers.
On Earth, the cycle of precession lasts 26,000 years. The planet Kepler-413b precesses, or wobbles, wildly on its spin axis, in a cycle of only 11 years.
On Jan 30, the moon moved between NASA's Solar Dynamics Observatory (SDO) and the sun, giving the observatory a view of a partial solar eclipse only visible from space.