Editing Rosetta (spacecraft) (section)

=== Notable results ===
[[File:Comet 67P on 31 January 2015 - NAVCAM.jpg|thumb|The comet in January 2015 as seen by ''Rosetta''{{'s}} NAVCAM]]
Researchers expect the study of data gathered will continue for decades to come. One of the first discoveries was that the magnetic field of 67P oscillated at 40–50 [[millihertz]]. A German composer and sound designer created an artistic rendition from the measured data to make it audible.<ref>{{cite web |url=http://blogs.esa.int/rosetta/2014/12/19/behind-the-scenes-of-the-singing-comet/ |title=Behind the scenes of 'The Singing Comet' |publisher=European Space Agency |first=Claudia |last=Mignone |date=19 December 2014 |access-date=18 October 2017}}</ref> Although it is a natural phenomenon, it has been described as a "song"<ref name="smithsonian20141112">{{cite news |url=http://www.smithsonianmag.com/smart-news/comet-has-welcome-song-rosetta-and-philae-180953303/?no-ist |title=Comet 67P Has a Welcome Song for Rosetta And Philae |publisher=Smithsonian.com |series=Smart News |first=Marissa |last=Fessenden |date=12 November 2014 |access-date=26 December 2014}}</ref> and has been compared to [[Continuum (Ligeti)|''Continuum'' for harpsichord]] by [[György Ligeti]].<ref name="classicfm20141114">{{cite news |url=http://www.classicfm.com/discover/music/singing-comet-67p-philae/ |title=Music emitted from Comet 67P sounds an awful lot like 20th-century harpsichord masterpiece |work=Classic FM |first=Tim |last=Edwards |date=14 November 2014 |access-date=26 December 2014}}</ref> However, results from ''Philae''{{'s}} landing show that the comet's nucleus has no magnetic field, and that the field originally detected by ''Rosetta'' is likely caused by the [[solar wind]].<ref name="esa20150414">{{cite news |url=http://www.esa.int/Our_Activities/Space_Science/Rosetta/Rosetta_and_Philae_find_comet_not_magnetised |title=Rosetta and Philae Find Comet Not Magnetised |publisher=European Space Agency |first=Markus |last=Bauer |date=14 April 2015 |access-date=14 April 2015}}</ref><ref name="nature20150414">{{cite journal |title=Rosetta's comet has no magnetic field |journal=[[Nature (journal)|Nature]] |first=Quirin |last=Schiermeier |date=14 April 2015 |doi=10.1038/nature.2015.17327|s2cid=123964604 }}</ref>

The [[isotopic signature]] of water vapour from comet 67P, as determined by the ''Rosetta'' spacecraft, is substantially different from that found on Earth. That is, the ratio of [[deuterium]] to [[hydrogen]] in the water from the comet was determined to be three times that found for terrestrial water. This makes it very unlikely that water found on Earth came from comets such as comet 67P, according to the scientists.<ref name="NASA-20141210-DCA">{{cite web |url=http://www.jpl.nasa.gov/news/news.php?release=2014-423 |title=Rosetta Instrument Reignites Debate on Earth's Oceans |publisher=NASA |last1=Agle |first1=D.C. |last2=Bauer |first2=Markus |date=10 December 2014 |access-date=10 December 2014}}</ref><ref name="NYT-20141210-KC">{{cite news |url=https://www.nytimes.com/2014/12/11/science/rosetta-mission-data-rules-out-comets-as-a-source-for-earths-water.html |title=Comet Data Clears Up Debate on Earth's Water |work=[[The New York Times]] |last=Chang |first=Kenneth |date=10 December 2014 |access-date=10 December 2014}}</ref><ref name="BBC-20141211">{{cite news |url=https://www.bbc.co.uk/news/science-environment-30414519 |title=Rosetta results: Comets 'did not bring water to Earth' |work=BBC News |last=Morelle |first=Rebecca |author-link=Rebecca Morelle |date=10 December 2014 |access-date=11 December 2014}}</ref> On 22 January 2015, NASA reported that, between June and August 2014, the rate at which water vapour was released by the comet increased up to tenfold.<ref name="NASA-20150122">{{cite web |last1=Agle |first1=D. C. |last2=Brown |first2=Dwayne |last3=Bauer |first3=Markus |url=http://www.jpl.nasa.gov/news/news.php?release=2015-029 |title=Rosetta Comet 'Pouring' More Water Into Space |publisher=NASA |date=22 January 2015 |access-date=22 January 2015}}</ref> <!--Please mine the article for actual information: On 23 January 2015, the journal ''[[Science (journal)|Science]]'' published a special issue of scientific studies related to the comet.<ref name="SCI-20150123">{{cite journal |url=https://www.science.org/toc/science/347/6220 |title=Catching a Comet |series=Special Issue. |journal=[[Science (journal)|Science]] |volume=347 |issue=6220 |date=23 January 2015 |access-date=23 January 2015}}</ref> -->

On 2 June 2015, NASA reported that the [[#Instruments|Alice spectrograph]] on ''Rosetta'' determined that [[electron]]s within {{convert|1|km|mi|1|abbr=on}} above the comet nucleus&nbsp;— produced from photoionization of water [[molecule]]s, and not direct [[photon]]s from the Sun as thought earlier&nbsp;— are responsible for the degradation of water and [[carbon dioxide]] molecules released from the comet nucleus into its [[coma (cometary)|coma]].<ref name="NASA-20150602">{{cite news|url=http://www.jpl.nasa.gov/news/news.php?feature=4609 |title=NASA Instrument on Rosetta Makes Comet Atmosphere Discovery |publisher=NASA |last1=Agle |first1=D. C. |last2=Brown |first2=Dwayne |last3=Fohn |first3=Joe |last4=Bauer |first4=Markus |date=2 June 2015 |access-date=2 June 2015}}</ref><ref name="AA-20150602">{{cite journal |title=Measurements of the near-nucleus coma of comet 67P/Churyumov-Gerasimenko with the Alice far-ultraviolet spectrograph on Rosetta |journal=[[Astronomy and Astrophysics]] |volume=583 |at=A8 |last1=Feldman |first1=Paul D. |last2=A'Hearn |first2=Michael F. |last3=Bertaux |first3=Jean-Loup |last4=Feaga |first4=Lori M. |last5=Parker |first5=Joel Wm. |last6=Schindhelm |first6=Eric |last7=Steiffl |first7=Andrew J. |last8=Stern |first8=S. Alan |last9=Weaver |first9=Harold A. |last10=Sierks |first10=Holger |last11=Vincent |first11=Jean-Baptiste |display-authors=5 |date=2 June 2015 |doi=10.1051/0004-6361/201525925 |bibcode=2015A&A...583A...8F |arxiv=1506.01203|s2cid=119104807}}</ref>