Kepler, the planet-hunting space telescope, is dead

3,000 potential exoplanets later, a failed reaction wheel means the end of the Kepler mission.

The Kepler telescope, a one tonne satellite launched in 2009 to scan for planets outside of our solar system, is dead.

Over the four years of its mission, the spacecraft has found over 3,000 stars which might have planets orbiting them, and the earth-based analysis has confirmed 134 planets orbiting 76 of them.

In April, the mission even announced the discovery of two potentially habitable planets. The two were roughly earth sized, and roughly earth temperature as well. Each of them might just lie in the "habitable zone", where liquid water can potentially exist.

Sadly, shortly after that discovery, Kepler ran into problems. The telescope manoeuvres through space with four reaction wheels, which keep it pointing in the right direction using a gyroscope effect. In July 2012, one of the wheels failed, but the mission was designed to only require three to accurately aim. In May this year, however, a second wheel failed. Yesterday, Nasa announced that they had given up trying to fix the wheels. Kepler can no longer be targeted accurately.

But, good news! Rumours of Kepler's death have been greatly exaggerated (by me, in paragraph one. Sorry.), because while the telescope can't be aimed any more, it's still useful. The imaging functionality works fine, and with two remaining reaction wheels and a limited amount of thruster fuel left it's even got a bit of manoeuvrability. NASA has opened it up to the community to work out the best way to make use of what's left working; one proposal, for instance, involves heavily post-processing the images to remove drift caused by the lack of a third wheel.

There's hope for the mission yet, which is great, because as Ars Technica's John Timmer writes, there's a lot more to learn:

A longer mission would identify planets further from their host stars. To identify a candidate, Kepler needs to see it pass between Earth and the star the exoplanet orbits three times. The further out a planet is, the longer one orbit takes, so the longer it will need to do three passes. As such, the existing data is heavily biased toward planets that orbit very close to their host stars; this also means that most of the potentially habitable planets we've spotted are orbiting dwarf stars, which are dim enough that water can remain liquid close in.

In other words, we simply haven't looked long enough to detect planets in a habitable zone around energetic stars. We have a much better picture of the diversity of exoplanets, but it's far from a complete one.

Kepler. Photograph: Wikimedia Commons

Alex Hern is a technology reporter for the Guardian. He was formerly staff writer at the New Statesman. You should follow Alex on Twitter.

Google Allo
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Google Allo: a chat app like WhatsApp – but with only a cursory consideration for your privacy

When will we stop sacrificing security for stickers of muscular bulls wiggling their butts? 

The world already has enough chat apps. When Google’s latest messaging service Allo launched this morning, a cursory glance showed us it had much the same features as Snapchat, WhatsApp, and Facebook Messenger before it. You can doodle on your pictures! Here’s an emoji with heart eyes! Look at this sticker of a bull twerking! Oh-by-the-way-we’re-reading-your-messages-hope-that’s-not-a-problem-bye!

Just like Facebook, Instagram, Skype, and Snapchat, the messages you send on Google Allo are not automatically end-to-end encrypted. This type of encryption – which Whatsapp began using in April – means that only you and the recipient of your message can read it and nobody in between. Messaging apps without end-to-end encryption can store your messages on their servers and access them at any time, as well as hand them over to the government if required by law. The technology academic and author John Naughton has likened it to “sending your most intimate secrets via holiday postcards” and Edward Snowden went as far as too call Google Allo “dangerous”.

But Google has a reason for not using end-to-end encryption (whether it’s a good one or not is up to you). The app includes Google Assistant, a tool which can answer your questions within any chat. In order for this to work, Google naturally needs to access your messages. Its new “Smart Reply” feature also means it reads and analyses your conversations to give you personalised auto-reply suggestions. Despite originally promising that it would only store your chat history for a limited amount of time, Google has now admitted that it will retain the data unless you personally choose to delete it. The app is actively trying to learn as much about you as possible, and then storing the data. 

But while Google Allo doesn’t automatically offer end-to-end encryption, it is receiving praise for the ability to opt in via “Incognito mode”. Once this mode is selected, you have end-to-end encryption on your messages, and you can set them to expire after a certain period of time. Wonderful. Brilliant. Article over. No more worries.

Except by placing the onus on the user to opt in to privacy (rather than opt in to Google Assistant) Google has played a trick that many companies have played before. Amazon recently launched a UK version of Echo, a “constantly listening” smart device that records and stores all of your questions, and gave users the option to mute the machine if they were concerned about privacy. But by its very nature, no one who desires this device is concerned about privacy.

And so too with Google Allo. Anyone worried about Snowden’s warning won’t download it, and those who do download it are unconcerned about, or unaware of, the lack of end-to-end encryption. Even the name, “Incognito mode” makes it sound like something that should be used for shady or saucy goings-on, instead of accepting that, by default, all of your private conversations should stay private.

Which begs the question: why don’t most of us care? Allo’s opt-in encryption is actually a vast improvement on Facebook Messenger’s complete disregard for this privacy measure, and that app has one billion active users. Are we truly so distracted by stickers and emojis that we don’t spare a thought for security? Our general apathy towards personal privacy sets a precedent for a future in which – and really, no tinfoil hats are needed here – none of our conversations are ever private.

You probably don’t care because your conversations are boring (no offence). It doesn’t worry us that the government or the police or big businesses are listening because all we’re talking about is whether to meet the lads in Nando’s at six or six-thirty. But no matter how inane our conversations, we should always protect ourselves from eavesdropping.

This is because, as the way Google search histories are used in court shows, your personal data can easily be misconstrued. If you ever did get in trouble with the police, can you really trust them to understand the private jokes between you and your friends, and not construe malicious meanings in your messages? What if third parties accessed your conversations? Companies already use our social media profiles to target advertisements towards us, but what if they scanned our messages to understand us better? Could your offhand conversation about how sick you’re feeling affect your health insurance claims? Will your message about money trouble prevent you from getting a loan?

These are all hypothetical questions, yes, but they are a path our apathy is driving us down. We’d much rather skip through the Terms and Conditions to get a new flashy feature than really scrutinise the data we’re giving away and how it’s used. Companies know this, which is why they hide behind opt-in features like “Incognito mode” and the “delete chat history” button. They can defend themselves by saying the option is there while simultaneously knowing that most people will never actually use it.

There is no easy way to get the wider world to care about privacy, but thankfully there’s probably no way to get them to care about Allo either. It’s not certain whether the messaging app will fail, but given the success of Google's previous chat apps (Talk or Hangouts, anyone?), it seems likely. Then again, none of those had a sticker of a muscular bull wiggling its butt.

Amelia Tait is a technology and digital culture writer at the New Statesman.