not to forget, esa developed a map of the southern hemisphere of the comet - here it is:

Comet southern hemisphere



Released 13/08/2015 4:30 pm
Copyright ESA/Rosetta/MPS for OSIRIS Team MPS/UPD/LAM/IAA/SSO/INTA/UPM/DASP/IDA

Four new regions, separated by distinct geomorphological boundaries, have been identified on the southern hemisphere of Comet 67P/Churyumov–Gerasimenko.
The complex season cycle on the comet means the southern hemisphere – which includes part of both comet lobes – had been undergoing winter for over five years. Around May 2015, seasons on the comet changed, throwing the southern hemisphere into a short – approximately 10 month – summer and revealing parts of the surface that were previously cast in shadow.

This allowed scientists to fill in some of the missing pieces of the comet’s regional map. Like the 19 regions that had been identified in January 2015, the four new ones are named for Egyptian deities, following the ancient Egyptian theme of the Rosetta mission: Anhur, Khonsu, Sobek and Wosret. Anhur and Khonsu can be found on the underside of the comet's larger lobe, Wosret on the smaller lobe, and Sobek is located on the comet's neck.

Comet surface changes



Sequence of ten images showing changes in the Imhotep region on Comet 67P/C-G. The images were taken with the OSIRIS narrow-angle camera on Rosetta between 24 May and 11 July 2015.
Credits: ESA/Rosetta/MPS for OSIRIS Team MPS/UPD/LAM/IAA/SSO/INTA/UPM/DASP/IDA



Same sequence as above, with indication of dates and location of the morphological changes.
Credits: ESA/Rosetta/MPS for OSIRIS Team MPS/UPD/LAM/IAA/SSO/INTA/UPM/DASP/IDA

and some details on this:



Colour images of the Imhotep region on Comet 67P/C-G, taken with the OSIRIS narrow-angle camera on Rosetta on 18 June (upper row), 2 July (middle row) and 11 July 2015 (lower row). The first column shows images taken in the orange filter (649 nanometres); the second column shows the ratio between images taken with the blue filter (481 nanometres) and the orange filter for the 18 June and 2 July images, and the ratio between images taken with the blue and the red (701 nanometres) filters for the 11 July image; the third column shows a composite obtained by combining the images in the previous two columns. The yellow arrows indicate some of the new features that were detected on Imhotep. These colour images show that some patches on the surface of the comet reflect orange/red light less effectively and blue light more effectively than their surroundings. They appear as white in the central column, where the colour ratio is shown. This indicates the presence of frozen water ice at or just below the surface of these patches. Credits: ESA/Rosetta/MPS for OSIRIS Team MPS/UPD/LAM/IAA/SSO/INTA/UPM/DASP/IDA

So these changes are due to the composition of the comet, which is changing due to the release of gas, due to our Sun?

yes, the comets surface shows changes but the release is not only gas but also dust particles
here another pair of images showing surface changes:



Activity seen above the Imhotep region with the OSIRIS narrow-angle camera on Rosetta on 23 May 2015 (left), before significant morphological changes were seen in this region, and on 23 June 2015 (right), after the changes had begun to appear. (Times are in UT.) The positions of the first two new features that were seen in Imhotep are marked with A and B. The white arrows indicate the direction along which an increase of activity would have been seen in the case of jets lifting from the newly arisen features. Credits: ESA/Rosetta/MPS for OSIRIS Team MPS/UPD/LAM/IAA/SSO/INTA/UPM/DASP/IDA

now one has to see what happened since june to those features

and one more scientific result:



23 September 2015
ESA’s Rosetta spacecraft has provided evidence for a daily water-ice cycle on and near the surface of comets.
...
The data suggest that water ice on and a few centimetres below the surface ‘sublimates’ when illuminated by sunlight, turning it into gas that then flows away from the comet. Then, as the comet rotates and the same region falls into darkness, the surface rapidly cools again.

for the whole article: http://www.esa.int/Our_Activities/Space_Science/Rosetta/Rosetta_reveals_comet_s_water-ice_cycle

Nice collection of pictures of a space rock. Have they learned anything about the age of the Solar System or how the Universe or Meteors were formed, or are they still going with the ridiculous theory that they were "from the primordial solar nebula as a group of planetesimals, the smaller precursors of the planets, which in turn formed protoplanets"?

Is this meteor from the Asteroid belt, Kuiper belts, or from the recently discovered Extrasolar Kuiper belts with its 8 black stars?

fyi: this "meteor" is a comet

and -> http://www.livecometdata.com/comets/67p-churyumov-gerasimenko/

"Comet 67P (Churyumov-Gerasimenko) is a Jupiter family comet"

Obviously didn't get my joke.



"For decades, the source of Earth's volatiles, especially water with a deuterium-to-hydrogen ratio (D/H) of (1.558 ± 0.001) × 10−4, has been a subject of debate. The similarity of Earth’s bulk composition to that of meteorites known as enstatite chondrites1 suggests a dry proto-Earth2 with subsequent delivery of volatiles3 by local accretion4 or impacts of asteroids or comets"

Do you believe that?

This post was edited by card_sultan on Sep 25 2015 12:58am

The image shown here was taken on 22 August 2014 at a distance of 63.4 km from the comet centre. It shows the comet’s small lobe to the left, with the striking cliffs of Hathor clearly visible. In the foreground on the far right, the smooth Imhotep region can be seen on the large lobe. The image scale is 5.4 m/pixel and it measures 5.5 km across.
Copyright ESA/Rosetta/Navcam – CC BY-SA IGO 3.0

how did rosetta get this odd shape? the answer can be found with details at
http://www.esa.int/Our_Activities/Space_Science/Rosetta/How_Rosetta_s_comet_got_its_shape