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

The Very Large Telescope sights Rosetta's comet target, sees activity beginning

Emily Lakdawalla • March 10, 2014

Rosetta's comet target, 67P/Churyumov-Gerasimenko, has emerged from behind the Sun as seen from Earth, and the Very Large Telescope has photographed it. The new images show that cometary activity has already begun as Rosetta approaches for its August rendezvous.

Hypervelocity Cratering and Riding Out the Risk

ESA Mars Express Team • March 06, 2014

Today's update from the Mars Express team contains the realisation that, for some of the risks associated with October's Siding Spring flyby, there may not be much the team can do.

Space is really, really big – except sometimes it isn’t

ESA Mars Express Team • March 04, 2014

Here's the next installment in the continuing story of how the Mars Express team is preparing for Comet Siding Spring flyby, 19 October 2014. This week: introducing the spacecraft's subsystems and structure – and wondering how we can absorb impacts.

Comet Siding Spring Mars encounter: Why orienting Mars Express is the heart of the challenge

ESA Mars Express Team • February 28, 2014

Today's post continues where we started last week with an update from the Mars Express Flight Control Team at ESOC on their preparations for the 19 October Comet Siding Springs flyby. Today: defining the challenge!

Mars Express team readies for Siding Spring

ESA Mars Express Team • February 26, 2014 • 3

On Sunday, 19 October 2014, at around 18:30 UTC, comet C/2013 A1 – known widely as 'Siding Spring' after the Australian observatory where it was discovered in January 2013 – will make a close fly-by of Mars.

Intro Astronomy Class 1: Tour of the Solar System

Bruce Betts • February 11, 2014 • 1

Take a tour of the Solar System in the video of class 1 of Bruce Betts' Introduction to Planetary Science and Astronomy class.

A new comet observing campaign for C/2013 A1 (Siding Spring)

Karl Battams • January 27, 2014 • 1

You thought you were rid of us...but we're back! Following the spectacular and, quite frankly unprecedented, success of the Comet ISON Observing Campaign, we are launching a similar venture for another unique cometary encounter that's happening this year. In October 2014, comet C/2013 A1 (Siding Spring) will pass extremely close to Mars.

Planetary Radio: NEOWISE PI Amy Mainzer

Mat Kaplan • January 01, 2014 • 1

NEOWISE has reawakened to discover many more asteroids and comets. The mission leader thanks the amateur astronomers who follow up on these discoveries.

Planetary Radio: Comet ISON, Rest in Pieces

Mat Kaplan • December 10, 2013 • 1

Karl Battams of NASA's Comet ISON Observing Campaign is our guest on this week's show. He explains how ISON really did become the comet of the century for scientists.

Comet ISON Wrap Up

Bruce Betts • December 05, 2013

Comet ISON captivated our world, and many of our world’s robotic emissaries for many months. But, alas, poor ISON is dead -- again. Here I wrap up our enthusiastic coverage of this multi-morphing zombie comet that tried to survive and re-survive as it came within one solar diameter of the Sun.

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