Stargazers will be treated to a rare alignment of seven planets on 28 February when Mercury joins six other planets that are already visible in the night sky. Here's why it matters to scientists.

The term may appear confusing, since the planets cannot actually fully line up in the three-dimensional solar system exactly as they may be seen in pictures; rather, it's our perspective of the ...

Barnard's Star is a small, dim star of the type that astronomers call red dwarfs. Consequently, even though it is one of the ...

Clear skies will also be necessary to see all the planets. The planets in the solar system orbit the sun, just as Earth does. Every planet orbits at a different speed and distance. During these ...

The planets orbit the sun continuously in the solar system, so at times, they slowly catch up to one another. Because they travel along the same path, or ecliptic, as they pass Earth ...

Astronomers have revealed new evidence that there are not just one but four tiny planets circling around Barnard’s Star, the ...

Once they are all in place, seven of the eight planets in our solar system will grace our sky. For much of the week, six of the planets may be visible, according to NASA. On Friday, however ...