Scientists Are Racing to Reach a Mysterious World Before It Disappears for 11,000 Years
In 2076, Sedna will make a once-in-11,400-year close pass near the Sun.
In 2076, Sedna will make a once-in-11,400-year close pass near the Sun.
Spacecraft pushed by photons might someday take us to other stars.
In 1976, Carl Sagan went on the Tonight Show with Johnny Carson along with a strange contraption, that looked like ...