The seven-year mission, which ended Friday, was one of the most consequential investigations into how space weather affects the environment just outside our planet’s atmosphere. ...

The background: The Van Allen radiation belts are zones of charged particles energized by intense solar winds and cosmic rays, stretching out from 400 to 36,040 miles above the surface. Earth’s magnetic field, which protects the planet from space radiation, actually ends up mostly trapping the particles into two layers within the magnetosphere.

Satellites and spacecraft in high orbits or on their way into deep space can be damaged by prolonged exposure to this radiation. Humans who spend too long in the Van Allen belts can suffer severe health problems. And the belts play a significant role in modulating space weather that could end up damaging satellites, power grids, and other electronic infrastructure on Earth. 

The probes: NASA launched two Van Allen probes in 2012 into an elliptical orbit to directly study the radiation belt. Each satellites used a suite of five instruments to detect particles and study the magnetic fields and plasma waves characteristic of the region of space directly around Earth. Probe B was shut down in July after it ran out of fuel, and NASA ceased probe A’s operations on Friday. The pair should fall back and burn up in the atmosphere in 15 years.

The legacy: Scientists used the mission to better understand the distribution of charged particles throughout the Van Allen belts, which is helping engineers design spacecraft that can better withstand extreme and extended cosmic radiation. There’s also a clearer understanding of how space weather causes the belts to swell and shrink over time, in what we now know is an 11-year cycle. More exciting was the discovery that additional transient belts can form during bouts of extreme solar activity. 

But the biggest impact of the Van Allen probes might be in their engineering. The primary mission was set for only two years, because it was feared that radiation would quickly erode the electronics. Yet the duo unexpectedly lingered on, and might have survived into the 2020s with enough fuel. As we consider long-term missions in space, the probes will be a lesson in how to think about spacecraft design.

What’s next: NASA doesn’t actually have any plans for a mission that compares to scope of the Van Allen probes, so we will have a dearth of space weather science for the foreseeable future. ESA’s Lagrange mission could be a powerful tool if it launches, and NASA’s upcoming TRACERS mission will flesh out how charged particles interact with the magnetic field at the poles.

Neither of these, however, will directly study the Van Allen belts. Meanwhile, NASA and NOAA have several spacecraft that monitor space weather and keep the agencies apprised of any solar events that could wreak havoc on modern-day electronic systems.



Third-party apps hosted on Google and Amazon smart speakers could be secretly eavesdropping on users or phishing for their passwords, according to Security Research Labs, a hacking consultancy based...

How they know: The company created eight apps—four for Amazon Alexa and four for Google Home—that surreptitiously logged all conversations within earshot of the device they were installed on, and then sent a copy to a designated server. They mostly masqueraded as apps for checking horoscopes, according to Ars Technica. In the eavesdropping version, a user would ask the app to give them a horoscope. It would respond with the information requested and then go silent, giving the impression it was no longer running when in fact it was still recording. The phishing-style apps gave a fake error message and then asked for the user’s password. They all passed Google’s and Amazon’s security vetting procedures, although they have since been removed. The developers explained how the apps were created in a post, which you can read here.

The companies’ response: Both told Ars Technica they are changing their approval processes to stop their products from being hijacked this way. However, that they were ever approved in the first place is evidence that tech companies do not invest enough time or energy in vetting the apps they choose to host on their platforms.

Mounting concern: It’s widely known that smart speakers pose a privacy threat. Workers employed by the likes of Amazon, Google, and Apple routinely listen to clips from users’ devices, and the sounds recorded from smart speakers can be used in criminal trials (not that this has dented their popularity with the paying public).

Some context: This isn’t the first time hackers have shown that a smart speaker can be turned into a spying device. In a December 2018 presentation at DefCon,  a pair of researchers proved it’s possible if you can get the attack tool onto the same Wi-Fi network. But this latest attack shows that the privacy threat from smart speakers could come not only from the manufacturers, but from hackers too.

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