"That the comet has such a fluffy interior is really valuable information in terms of how to design the landing mechanisms, and also for the mechanical processes that might be needed to retrieve samples," said Matt Taylor, a project scientist on the Rosetta mission, in an ESA press release. Of course this is a miracle: a huge rock in space, 300m miles away, moving at 40,000mph, and here’s our little craft snapping away as it bounces down on to it. Philae was monitored and operated from DLR's Lander Control Center in Cologne, Germany.
These images, with a resolution of 100 metres per pixel, were acquired with the OSIRIS scientific imaging system on board Rosetta. On 15 September 2014, ESA announced "Site J" on the smaller lobe of the comet as the lander's destination. As Stuart and James noted earlier, even the rotation of a drill could dramatically change how Philae stands on the surface.
Spacecraft Crash-Lands on Comet in Epic Mission Finale", "The tech behind the Rosetta comet chaser: From 3D printing to solar power to complex mapping", "Historic Comet Landing Site Has a New Name: Agilkia", "Will Philae successfully land on comet?
, On the morning of 14 November 2014, the battery charge was estimated to be only enough for continuing operations for the remainder of the day.
In the second phase, it was to run on backup batteries recharged by solar cells.  The harpoon propulsion system contained 0.3 grams of nitrocellulose, which was shown by Copenhagen Suborbitals in 2013 to be unreliable in a vacuum.
, The search area was narrowed down to the most promising candidate, which was confirmed by a picture taken at a distance of 2.7 km (1.7 mi), clearly showing the lander.  During this first bounce, at 16:20 UTC SCET, the lander is thought to have struck a surface prominence, which slowed its rotation to once every 24 seconds and sent the craft tumbling.  Its final location was determined initially by analysis of data from CONSERT in combination with the comet shape model based on images from the Rosetta orbiter, and later precisely by direct imaging from Rosetta. Available for everyone, funded by readers, Probe’s final resting spot in the shadow of a cliff has meant that insufficient sunlight reached its solar panels, Final attempt to jolt space lander into sunlight to recharge batteries fails – but officials still hope it could be revived in August 2015 when comet gets closer to the sun, Taylor breaks down during apology for sexist shirt as he delivers progress report on comet mission, Lander rotates into slightly sunnier position but apparently too late to charge batteries and keep systems running.  On 31 December 2014, Google featured Philae again as part of its New Year's Eve 2014 Doodle.
 During the landing, the harpoons did not fire and the thruster failed to operate, leading to a multiple-contact landing.. , The search area was narrowed down to the most promising candidate, which was confirmed by a picture taken at a distance of 2.7 km (1.7 mi), clearly showing the lander.  Ground controllers sent commands to power up the CONSERT radar instrument on 5 July 2015, but received no immediate response from the lander. CONSERT links up with Rosetta, and is also being used to help triangulate Philae’s position, which we still don’t know with much precision. Probes are listed in chronological order of launch. Receive news, sky-event information, observing tips, and  For perspective, had the lander exceeded about 44 cm/s (17 in/s), it would have escaped the comet's gravity. Scientists have reconstructed its bumpy landing on the surface in 2014 for the first time.  The harpoon propulsion system contained 0.3 grams of nitrocellulose, which was shown by Copenhagen Suborbitals in 2013 to be unreliable in a vacuum.
 As of June 2015[update], Philae's key remaining experiment was to drill into the comet's surface to determine its chemical composition.  Subsequently, Philae failed to respond to further commands, and by January 2016, controllers acknowledged no further communications were likely. In 2014, it was released from the European Space Agency's Rosetta spacecraft to touch down on 67P, but not everything went according to plan.
It’s flat, flat like hell, which is great.”, That’s a project manager during today’s earlier Esa briefing, he’s happy but a bit rueful: “We wished it would’ve stayed there, but it didn’t.”.
It would later be known that these had likely come from the direction of the now named comet 67P. ESA’s confirmation that the comet had been emitting a “mystery song” has fuelled theories that it is in fact an alien ship and the warbling is an extra-terrestrial attempt at communication. , On 27 July 2016, at 09:00 UTC, ESA switched off the Electrical Support System Processor Unit (ESS) onboard Rosetta, making further communications with Philae impossible. It began performing scientific measurements while slowly moving away from the comet and coming back down, confusing the science team.
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