Such events occur roughly every one to two years, on average. Update: Today's livestream of the solar system planets will now begin at 12:30 p.m. EST (1730 GMT). Take a grand tour of the solar ...

Astronomers have discovered a rare in-sync solar system with six planets moving like a grand cosmic orchestra, untouched by outside forces since their birth billions of years ago. The find ...

A team of astronomers believe they may have discovered a new dwarf planet—just like Pluto—on the edge of our solar system. The object—which orbits out beyond Neptune—has been named "2017 OF201" by the ...

Though Pluto has formally been considered a dwarf planet for almost two decades, it still has many lessons left for planetary scientists — including hints about how the solar system formed.

A 9th planet in our solar system might be found — and no, it’s not Pluto. ... The researchers used surveys of the sky from two infrared space telescopes that were launched in 1983 and 2006.

If there were one, that Planet Nine would "nudge the closest part of 2017 OF201's trajectory inward until Neptune flung it out of the solar system." Because 2017 OF201 is there, that could be an ...

Space. Tatooine-like planet outside the solar system may orbit twin stars. The exoplanet, which is about 120 light years away, appears to take an unusual path around two brown dwarfs.

This region is filled with asteroids and dwarf planets, such as Pluto, that have been ejected from the inner solar system by one-sided gravitational tugs-of-war with the planets.. Some astronomers ...