Below are two photos of comet 67P/Churyumov- Gerasimenko. The first is a close-up of the so called body, the second is a portion of the head. These two areas have numerous matching points showing that they were once joined together. It therefore follows that 67P/C-G was once a single body that has since been stretched, resulting in the two lobes we see today.

67P/C-G is therefore not a contact binary as has been suggested. Nor is it an unstretched single body that has been eroded to form the separate head and body.

As it’s clear the comet was stretched, it must have been subjected to one of two scenarios. It either underwent a close approach to Jupiter under the Roche limit in the distant past or it underwent spin-up to around a 90-120 minute rotation period which would overcome its gravitational pull. The former scenario would need to allow stretching…

I hope this does not come true.

A cliff hanger descended over the Rosetta space mission as fate casts a shadow when an attempt at landing went fatally awry.

It turns out that fragile and complex technology was used instead of robust tried and tested nuclear plant. Fault intolerance.

The solar cells in Rosetta’s solar panels are based on a completely new technology, so-called Low-intensity Low Temperature Cells. Thanks to them, Rosetta is the first space mission to journey beyond the main asteroid belt relying solely on solar cells for power generation. Previous deep-space missions used nuclear RTGs (Radio isotope thermal generators). The new solar cells allow Rosetta to operate over 800 million kilometres from the Sun, where levels of sunlight are only 4% those on Earth.
— http://www.esa.int/Our_Activities/Space_Science/Rosetta/Frequently_asked_questions

But they forgot the possibility of or ignored an unknown environment might have cliffhangers waiting. It has landed in shadow.