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Orbit of Comet Churyumov-Gerasimenko. (Credit: Subrban Spaceman) Mona Evans, "Rosetta the Comet Chaser" http://www.bellaonline.com/articles/art182574.asp

Rosetta and Philae - infographic. (Credit: European Space Agency) Mona Evans, "Rosetta the Comet Chaser" http://www.bellaonline.com/articles/art182574.asp

Comet 67P/Churyumov-Gerasimenko on 20 May 2015 – taken by Rosetta's NavCam. (Copyright: ESA/Rosetta/NavCam) Rosetta was 163.6 km (100 miles) from the comet centre. Mona Evans, "Rosetta the Comet Chaser" http://www.bellaonline.com/articles/art182574.asp

Imhotep region on Comet 67P/Churyumov–Gerasimenko - geological mapping. (Image credit: ESA/ Rosetta/ MPS for OSIRIS Team MPS/ UPD/LAM/IAA/SSO/INTA/UPM/DASP/IDA) Mona Evans, "Rosetta the Comet Chaser" Mona Evans, "Rosetta - the Comet Chaser) http://www.bellaonline.com/articles/art182574.asp

Comet 67P/Churyumov-Gerasimenko, taken on 2014-08-09. (Copyright ESA/Rosetta/NAVCAM) This picture was taken at a distance of just under 100 km. Mona Evans, "Rosetta the Comet Chaser" http://www.bellaonline.com/articles/art182574.asp

In case you have been scoffing at the size of tiny comet Churymov-Gerasimenko (AKA the rubber ducky comet) that spacecraft Rosetta has been exploring, here's an image that shows it on the same scale as downtown Los Angles. (Michel, AKA @quark1972 on Twitter.) Mona Evans, "Rosetta the Comet Chaser" http://www.bellaonline.com/articles/art182574.asp

Comet 2P/Encke. 2013-10-12. (Credit: D. Peach) Mona Evans, "Comets" http://www.bellaonline.com/articles/art33712.asp

The Rosetta spacecraft saw its destination (Comet 67P/Churymov-Gerasimenko) on March 20, 2014 from about three million miles (five million kilometers) away. The comet is in the small circle next to the globular star cluster M107. (credit: ESA/MPS for OSIRIS-Team MPS/UPD/LAM/IAA/SSO/INTA/UPM/DASP/IDA) Mona Evans, "Rosetta the Comet Chaser" http://www.bellaonline.com/articles/art182574.asp

Halley's Comet, observed October 29, 1835. Observers noted the streams of vapor coming out of the comet. Mona Evans, "Halley's Comet" http://www.bellaonline.com/articles/art44795.asp

Comet Hale-Bopp (Credit: A. Dimai and D. Ghirardo) It was also called the Great Comet of 1997 and was a naked eye object for eighteen months. The comet was not only extremely bright, but also had two tails. Mona Evans, "Comets" http://www.bellaonline.com/articles/art33712.asp