About this blog

This blog is operated by the European Space Agency (ESA) as an unofficial and in-depth source of information for anyone interested in the Rosetta mission.

It is updated by editors from the ESA Space Science and ESA Human Spaceflight & Operations communications teams with input from Rosetta scientists and engineers.

The team will certainly do their best to get you the latest information on the wake up of Rosetta on 20 January 2014, and throughout the entire mission as the spacecraft reaches, orbits and deploys a lander onto comet 67P/Churyumov-Gerasimenko.

Nonetheless, the blog is provided strictly on an unofficial, best-effort basis and ESA makes no warranty that the information, news, comments or opinions published in this blog are confirmed, accurate, official or in any way reflect the formal policies of the European Space Agency or our partners.

For the latest confirmed information relating to any ESA activity, please access the main ESA Web portal. For background information and official news relating to Rosetta, please visit our Rosetta minisite.

Public comments

We welcome your comments, feedback and questions – you’ll find the comment box at the foot of every blog post. We’ll do our best to answer your questions within a reasonable amount of time, however we cannot guarantee that all questions will be answered. Comments may be edited for clarity or length.

All public comments remain the property of the individual who posts them and ESA expressly disclaims any responsibility for their content or accuracy.

Off-topic comments and queries or any comment that is deemed inappropriate by the editors will be deleted.



  • Kagan Kayal says:

    Dear web admin,

    this blog is nice, but how do I switch off the background audio? It is louder than the video embedded on the page.



  • Mark L. Ferguson says:

    Rosetta is in an interesting solar orbit position to observe the point opposite earth orbit called Earth Sun L 3. I wonder if it would be possible to catalog some asteroids parked there. WISE, or any earth based viewing is of course impossible.

  • sixthousand says:

    amazing project. thanks for sharing all this information and media. FYI your datetime settings seem to be a bit off. Most recent posts are dated more than 1 full day in the future.

  • Jan Boles says:

    Can you please provide some details of the Rosetta NAVCAM? E.g., the focal length/aperture of the lens, the specs on the sensor. The quality of the images is astounding, given the distance between Rosetta and the comet.

  • Jouni Issakainen says:

    Dear Rosetta Team,

    Regarding the constricted “neck” of comet 67P and of some other comets: Are there any forces during the sun passages that would re-align the comet to such a spinning position that the neck area would erode systematically more than the “heads”? (cf. a yo-yo and its string), i.e. could a nearly rod-like comet gradually create a thinner neck? Thanks for your comment!

    Jouni Issakainen

  • Robin Sherman says:

    What has happened to the blog posted by Emily on 15/10/2014 about the confirmation of the primary landing site?

    A number of posts made on the 10/10/2014 blog page are no longer there since the change of page design. Why is there now no opportunity to reply to specific posts?

  • atnt says:

    On some versions of Firefox (23.0), all the posts after 10/10/2014 are not visible!
    On Internet Explorer 8, it is OK.

  • Dane Cubric says:

    I’ve followed your mission with great interest.
    It does deserve some memorabilia for people to remember.
    I’ve created a tee shirt, advertised to my friends and family, to celebrate the event.
    Wish you every success possible.

  • sepiae says:

    Congratulations !!!!! 🙂

    And thank you, everyone involved in the landing !

    I was too young for the 1st moon landing. This is kinda like it.
    No greater inspiration in the news than this !!!1 🙂

  • Guido says:

    Would you PLEASE use black letters on white background?
    Not a light-blue
    For me (in the 50ies with glasses) is it very difficult to read the articles!

  • Guido says:


    anyway, congrats to the team of rosetta and philae!

  • Stephen Pain says:

    I have been thinking of the problem regarding the energy source for the lander. The solution lies in being able to co-opt what is available on location, i.e. to adopt a Robinson Crusoe mentality – here I think that just as battery free wifi and communication is being developed that the ambient waves of the comets should in future be used to i) recharge the batteries ii) as a communication/energy source. The probe could be utlized in this. On top of this I would look to a battery design that can make use of elements in the comet itself – treating it like a “lemon” battery. I write this because it seems so much is at stake in making sure the lander is positioned for optimising solar energy intake – that any miscalculation or error in systems will impact on the results – results which are the very motivation behind the chase. Develop ambient wave batteries (AWB) and you won’t suffer from this problem again.

  • Nelson S. says:

    Hi! On a purely graphic design perspective I must say it’s quite tough to read light gray on a white background. I tried on two displays so I don’t think I’m being picky..Let’s be functional! (I can barely read my post!)

  • Anthony says:

    This is a practical experiment. So far 67P-G/G appears to be a piece of rock. Nothing reported thus far indicates an iceball formed from a primodial nebula cloud. Seems to me when astrophysicists use mass in their equations they simply do not know what they are talking about. Can you at least tell me what the measured density of 67P-G/G is?


  • emily says:

    You can find the density and other parameters here: http://blogs.esa.int/rosetta/2014/10/03/measuring-comet-67pc-g/
    Density is quoted as 0.4g/cm^3

  • Quirky Elf says:

    Absolutely fascinated by Philae, Rosetta and the Comet journey BUT can’t read the grey font on your site at all. Is this a problem with Chrome, my ancient eyes or a technical hitch? #Landsonacometbutmakesithardforustofollow

  • Barry White says:

    Your blog has the low contrast text that is plaguing so much of the Internet. Light gray text against a light background just doesn’t provide enough contrast, especially for seniors like me. It’s like staring at a blank sheet of paper.

  • Peter says:

    The blog is great. Could you please link it somehow into the official ESA web seite http://www.esa.int, maybe in the footer area (for example and (just to clarify). (There seems to be no mentioning or linking from http://www.esa.int into blogs.esa.int).

    • emily says:

      Thanks! The blog has always been linked from the front page of esa.int (in the Focus On section), as well as from various sub-sections like esa,int/science and esa.int/rosetta. Likewise the blog links back to esa.int. Thanks for following!

  • Ben Dubrovsky says:

    Hi Rosetta team! If it’s possible that Philae has moved, could we not expand our ability to listen for it? We’ve got several satellites orbiting Mars. Could any of those be directed to listen for transmissions from Philae? I imagine that Philae’s transmitter strength isn’t super strong, but Mars is a lot closer to it now than Earth is.


  • George Nixon says:

    The management and scientific Team in charge of the Rosetta Project deserve to be heartily congratulated for their efforts to date, and for the decision to extend the project to allow an opportunity for Phiale to be reactivated under much less perilous conditions as the comet travels away from the sun.
    Also, for providing an ability to check outbound activity against inbound activity. Especially so because comet 67P will be travelling outbound in its orbit relative to the retarding gravitational effect of Sun, Earth, Mars, and Jupiter.

  • Ionel DINU says:

    What is the gravitational field strength of the comet? Do you have any data on this? Thanks.

Comments are closed.