The six planets were visible in the days immediately leading up to Jan. 21, and for about four weeks afterward. Mars, Venus, Jupiter and Saturn should be visible to the naked eye. You'll need a ...
Astronomers discovered the exoplanet in 2016, a gas giant that’s slightly larger than Jupiter with a fraction of its mass, ...
A planetary alignment occurs when several planets gather on one side of the Sun, appearing to form a line from our ...