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Stories, updates, insights, and original analysis from The Planetary Society.

How the European Space Agency Does Planetary Defense

Defending the planet from the hazard of potential asteroid impacts requires investments from the whole world. In Europe, the European Space Agency (ESA) and the European Union both support work to understand and mitigate the threats from near-Earth objects.

The State of Planetary Defense

Vishnu Reddy delivers a sober but hopeful report on our understanding of near-Earth objects, their dangers, and our readiness.

Flying By Home

Vicky Hamilton explores how OSIRIS-REx used its Earth flyby to test instruments on the way to asteroid Bennu.

News brief: OSIRIS-REx finds water on Bennu

OSIRIS-REx team members held a press briefing today at the 2018 American Geophysical Union meeting, and announced that the mission has already found water on asteroid Bennu.

Hayabusa2 has detected Ryugu!

In a milestone for the mission, JAXA's Hayabusa2 sample return spacecraft has sighted its destination, asteroid Ryugu.

Favorite Astro Plots #1: Asteroid orbital parameters

This is the first in a series of posts in which scientists share favorite planetary science plots. For my #FaveAstroPlot, I explain what you can see when you look at how asteroid orbit eccentricity and inclination vary with distance from the Sun.

PROCYON update: Asteroid 2000 DP107 target selected, ion engine stopped

PROCYON (PRoximate Object Close flYby with Optical Navigation) is a microsatellite that launched on December 3 as a secondary payload with Hayabusa2. The mission has now selected their asteroid flyby target -- a binary asteroid named 2000 DP107 -- but is reporting a problem with their ion engines.

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