We've known for over 30 years that there are other stellar systems in our galaxy, but we don't have any idea how many there ...

The world of Sailor Moon does not just relate to our own solar system, but the many unknown planets from the original story ...

All eight planets in the solar system orbit the sun at different speeds but on roughly the same plane. This is because the planets are thought to have been formed by a massive ring of gas and dust ...

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 ...

The Sun, the main source of light and energy, is the brightest object in our solar system, shining on and lighting up all other celestial bodies. Jupiter, the biggest planet in our solar system, ...

A new classification scheme may help us better understand planet formation — including the history of our own family of worlds.

For example, the three innermost planets — Mercury, Venus and Earth — align within 3.6 degrees in the sky every 39.6 years. For all of the solar system's eight planets to align as closely ...

The findings provide strong evidence that four giant exoplanets 130 light-years from Earth formed much like Jupiter and ...

Seven planets aligned in the night sky on Friday, Feb. 28, viewable from Earth. A similar planetary alignment with six planets will occur on Aug. 29. The planets appear to align from Earth's ...

The outermost three planets are also Neptune-like, with 2.8, 8, and 11 times Earth’s diameter. Thus, the system’s overall architecture resembles a condensed version of our solar system’s ...

A distant exoplanet discovered, named Enaiposha, is unlike anything found in our own solar system, similar to a "super-Venus" ...

How do planetary alignments work? The planets in the solar system orbit the sun, just as Earth does. Every planet orbits at a different speed and distance. During these alignments, the planets ...