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Our journalists and guest bloggers bring you stunning imagery and the space stories that matter most.

When will we know which is bigger, Pluto or Eris?

Emily Lakdawalla • April 30, 2014 • 8

We don't currently know whether Pluto is the biggest thing in the Kuiper belt or not. When will New Horizons give us the answer?

This is the post where you can comment about the IAU planet definition

Emily Lakdawalla • April 30, 2014 • 33

An attempt to corral the discussion of the IAU planet definition in one place on planetary.org, so that we may be free to actually discuss Kuiper belt observations and scientific results on posts elsewhere on this site.

Intro Astronomy 2014. Class 10: Trans Neptunian Objects including Pluto, KBOs, Comets

Bruce Betts • April 18, 2014

Explore the worlds beyond Neptune including Pluto, Kuiper Belt Objects and comets in this video of class 10 of Bruce Betts' Introduction to Planetary Science and Astronomy class.

More excitement in the outermost solar system: 2013 FY27, a new dwarf planet

Emily Lakdawalla • April 02, 2014 • 7

On the heels of last weeks reports of a second Sedna and a ringed Centaur comes a third cool outer solar system discovery: A new, likely large member of the Kuiper belt. With an absolute magnitude of about 3.0, the new object currently known as 2013 FY27 is the tenth brightest object beyond Neptune .

Hangout on Air: Why yesterday was a good day for Solar System Science

Emily Lakdawalla • March 27, 2014

On Wednesday, March 26, two important discoveries in the outer solar system were announced: the discovery of the second confirmed member of the Inner Oort Cloud (2012 VP113) and the discovery of rings around the planetesimal Chariklo. In a Hangout on Air, a rag-tag group of planetary scientists and astronomers active on Twitter talked about the discoveries.

A second Sedna! What does it mean?

Emily Lakdawalla • March 26, 2014 • 11

2012 VP113 is a new world that has been discovered on a Sedna-like orbit. What does that mean? It could imply the existence of a planet X, but doesn't prove it. It does suggest that a lot more Sednas are waiting to be discovered.

2015 will be the Year of the Dwarf Planet, and you need to tell people about it!

Emily Lakdawalla • March 05, 2014 • 11

I am very excited about 2015, more so than I have been about any year since I started working at The Planetary Society. Dawn will enter orbit at Ceres, and New Horizons, which will fly past Pluto and Charon. But if we want this kind of exploration to continue, I'm challenging you, dear readers, to tell the world why such non-planetary worlds are compelling places to go exploring.

Predicting Pluto's moons and moondust

Emily Lakdawalla • February 19, 2014 • 2

Why didn't we discover Pluto's moons until more than a decade after Hubble launched? Mark Showalter helps me answer this question.

New Horizons: Updates From the Science Team Meeting, Part 1

Ted Stryk • January 23, 2014 • 1

Ted Stryk reports on the status of the New Horizons mission from the mission's latest Science Team Meeting.

America's Pastime: Planetary Science

Mat Kaplan • October 15, 2013

Apologies to baseball fans and others for the theme of this week's Planetary Radio preview, which has star player Emily Lakdawalla on deck.

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