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

Some big moons in the Kuiper belt

Emily Lakdawalla • January 25, 2018 • 1

In a new preprint, Mike Brown and Bryan Butler show evidence that two Kuiper belt moons are even bigger than we used to think. They are Eris' moon Dysnomia, and Orcus' moon Vanth.

New Horizons prepares for encounter with 2014 MU69

Emily Lakdawalla • January 24, 2018 • 6

Throughout 2018, New Horizons will cruise toward its January 1 encounter with 2014 MU69. Preparations for the flyby are nearly complete.

In total eclipse of a star, New Horizons' future flyby target makes its presence known

Emily Lakdawalla • July 19, 2017

The team reported two weeks ago that the first attempts at observing 2014 MU69 were unsuccessful. But in their third try, on July 17, astronomers in Argentina saw the telltale sign of MU69's presence: a stellar wink.

DPS/EPSC update on New Horizons at the Pluto system and beyond

Emily Lakdawalla • October 25, 2016 • 4

Last week's Division for Planetary Sciences/European Planetary Science Congress meeting was chock-full of science from New Horizons at Pluto.

DPS/EPSC update: 2007 OR10 has a moon!

Emily Lakdawalla • October 19, 2016 • 5

The third-largest object known beyond Neptune, 2007 OR10, has a moon. The discovery was reported in a poster by Gábor Marton, Csaba Kiss, and Thomas Mueller at the joint meeting of the European Planetary Science Congress and the Division for Planetary Sciences of the American Astronomical Society (DPS/EPSC) on Monday.

Pluto is not the end

Emily Lakdawalla • July 14, 2016 • 14

One year after the New Horizons Pluto flyby, Emily reflects on its significance.

"Planet Nine" update: Possible resonances beyond the Kuiper belt?

Emily Lakdawalla • March 08, 2016 • 27

A new paper by Renu Malhotra proposes that an undiscovered distant planet could have organized extremely distant Kuiper belt objects into orbital resonances.

30th anniversary images of Uranian moons

Emily Lakdawalla • February 02, 2016 • 6

January 24 was the 30th anniversary of the Voyager flyby of Uranus. Uranian moons have been on my mind ever since New Horizons sent us close-up images of Charon. On the occasion of the anniversary, Ted Stryk produced latest-and-greatest versions of the Voyager views of these worlds.

xkcd: Possible Undiscovered Planets

Emily Lakdawalla • January 22, 2016 • 3

Randall Munroe is a genius at disguising seriously educational infographics as funny jokes.

Theoretical evidence for an undiscovered super-Earth at the edge of our solar system

Emily Lakdawalla • January 20, 2016 • 37

It's looking likelier that there is an undiscovered planet orbiting beyond the Kuiper belt. If it's there, it's roughly 10 times the mass of Earth (or about half the mass of Neptune), likely never gets closer to the Sun than about 100 AU, and takes more than 10,000 years to orbit the Sun.

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