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Spacecraft Philae wakes up after seven months on a comet and contacts mother Earth


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Spacecraft Philae wakes up after seven months on a comet and contacts mother Earth

The European Space Agency says the comet lander Philae has woken up after seven months and sent messages back to Earth.

Last November Philae became the first spacecraft to land on a comet, named 67P, having been dropped there by its mothership Rosetta.

At the time there were celebrations for the project team, but Philae was only able to work for around sixty hours before its solar-powered batteries went flat.

It had landed in a ditch on the comet and that severely limited the amount of sunlight it needed to recharge the batteries.

Engineers now think the comet is moving towards the sun and the increasing intensity of the light reaching Philae’s batteries could be sufficient to recharge them.

The scientists are now feeling optimistic and are awaiting the next messages from Philae.

Analysis: Philae is awake! What now for the fairytale Rosetta mission?

The news that Philae is awake and sending messages to its Rosetta mothership is the biggest news in space exploration this year, writes Jeremy Wilks, Euronews’ space expert.

The world has been waiting for seven months for news from the little lander, which famously bounced down onto comet 67P/Churyumov–Gerasimenko last November. Now this story has become a fairytale. The Sleeping Beauty of space has stirred from its slumber.

The call from Philae came on Saturday night, and was confirmed by the European Space Agency (ESA) on Sunday. Now the question is: ‘What next?’

There’s an answer. The Rosetta and Philae teams, spread all over Europe, have not been caught out by this breaking news.

In fact they have spent a fair amount of time planning exactly what kinds of science operations Philae could do if it came back to life, and will have a clear list of tasks for it, ranked according to scientific importance and their expected demand on the probe’s energy levels.

Those tasks could begin with low power jobs such as taking photos and temperature readings. Then, if Philae is performing well, they could move on to more complicated tasks, such as using the famous drill to dig into the comet surface and take a sample.

The drill didn’t reach the surface in November because Philae landed awkwardly, sprawled across a cliff. But the lander’s body can rotate on its legs, so it could get another chance to poke its instruments into the primordial cometary material below.

There are also some members of the science team who have suggested trying to make Philae hop, but it’s a high-risk manoeuvre that nobody will be contemplating for many months to come, if ever.

The great news is that it appears that Philae has been awake and calling for its mummy for some time, perhaps a few days. The information from the lander passed to Earth through Rosetta will give vital information about how much light it is receiving, which impacts how much power it has.

The data from the German Space Agency (DLR) in Cologne, where Philae is controlled, is that the robot explorer has an operating temperature of minus 35 degrees Celsius and 24 watts of power. Sounds cold to you and me, but it’s pretty good for Philae.

Those figures could improve over the coming weeks, too, as Philae is hurtling towards the inner solar system on board the comet. Its closest approach to the Sun is due in August, when the comet will be around about the same distance from our star as the planet Mars.

Why is all this interesting and useful? It’s interesting because the Rosetta mission is arguably the most ambitious mission ever flown by ESA and it partners CNES, DLR, ASI, NASA and MPS, and it shows how far mankind can go in exploring the solar system if the greatest minds in spacecraft control and navigation, science instrument design and robotics are brought together to work as a team.

It’s useful because the science is extremely important: comets are made from the oldest material in our solar system, so if we can work out what they’re made from, we might find out where we came from. It’s as simple and profound as that.

Meanwhile the larger Rosetta mission has been in full swing all the while we’ve been waiting for Philae, gathering surprising new data about the comet, and observing how it changes as it approaches the Sun, jets of gas and dust spraying out from below the surface.

The mission has taught us a lot already, and sent many experts back to the drawing board, in particular the finding that the water on this comet does not match the water on Earth (as had been expected) and the comet does not have a magnetic field, something that leaves planetary formation theorists scratching their heads.

Many, even in the Rosetta team, thought the Philae adventure was over. It’s not, and there are likely many more surprises to come from this groundbreaking space mission.


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