Farout art

Solar System

60-second Astro News: Most Distant Solar System Object & Saturn's Disappearing Rings

In astronomy news this week, astronomers announce the most distant solar system object discovered to date and estimate the limited lifetime of Saturn's spectacular rings.

Planet Nine orbital plot

Solar System

New Wrinkles in the Search for “Planet X”

Are astronomers being misled about a possible ninth planet by the quirky alignment of orbits that they’re finding in the distant Kuiper Belt?

Pro-Am Collaboration

Find New Worlds, Film an Eclipse & Do Some Citizen Science!

Hankering to discover new solar systems or understand our own? These citizen science projects and public data troves will help you fill your free time.

Planet Nine orbit plots

Solar System

Orbital Path Podcast: In Search of Planet 9

Astronomers are debating the existence of a big planet beyond the orbits of Pluto and Neptune. Dr. Michelle Thaller talks with planetary scientists Scott Shepard and Mike Brown about when we'll discover it.

TNO Niku

Solar System

Retrograde Rock "Niku" Defies Orbital Trend

The discovery of trans-Neptunian object 2011 KT19 in a strange orbit deepens a key mystery in the outer solar system.

Planet Nine orbital plot

Solar System

Making the Case for "Planet Nine"

Does a massive, extremely distant planet orbit the Sun? A new analysis of distant solar-system orbits argues that it should exist.

Orbits of 2012 VP113 and Sedna

Solar System

New Object Offers Hint of "Planet X"

Astronomers have kicked around the idea of a distant "Planet X" for decades. But the recent discovery of 2012 VP<sub>113</sub>, located in an orbital "no man's land" roughly twice as far away as Pluto, has stoked the possibility that it really exists.

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