NASA’s Mars InSight lander provided researchers with the data needed to give us our first detailed look at the red planet’s crust, mantle and core. That map doesn’t include any information on the structures nearer its surface, however, and we need that to be able to get a more complete picture of how the planet was formed. Now, a team of scientists was able to create the first detailed image of what lies right underneath the planet’s surface, showing three billion years of its history, by listening to Martian winds.

More precisely, they analyzed the ambient noise (in the absence of marsquakes) collected by the seismometer that was installed by the InSight lander. On Earth, that kind of ambient seismic noise is generated by the ocean, human activity and winds, but only the last one is present on Mars. The Swiss Seismological Service (SED) and ETH Zurich have been regularly analyzing data collected by the seismometer as part of the Marsquake Service. Over the past years, SED was able to develop ways to analyze ambient noise data to define geological structures here on Earth, and those are the techniques they used on the data from InSight.

Based on the data the tool gathered, the top three meters of InSight’s landing site is made of sand, while the next 20 meters are loose material, particularly volcanic rock fissured by meteorite impacts. Underneath that sand and rock lie lava flows divided by sediments that formed when the planet experienced cold and dry conditions. Researchers believe the uppermost lava flows were deposited around 1.7 billion years ago, while the deepest ones were deposited as far back as 3.6 billion years ago at a time when there was a lot more volcanic activity on the planet. 

The researchers recently published their study in Nature, and one of the things they emphasized is that it proves techniques to investigate our planet can also work on Mars. Other methods used to know more about Earth could also give us more information about the red planet, which may one day become humanity’s second home. 

Source: Engadget – Scientists used Mars’ ambient noise to map the planet’s subsurface layers

When Spotify announced its stripped down Car View mode in 2019, it seemed like a smart way to prevent drivers from being distracted on the road. Whenever you connected to your car over Bluetooth, it would remove extraneous elements like menu buttons and album art. Instead, it gave you large buttons to pause and play music; jump to the previous or next track; or like a specific song. Nifty! But hope you didn’t get too attached, as Spotify has confirmed it’s “retiring” the feature, according to a recent support thread (via Android Police).

A Spotify moderator, who was replying to a user who noticed the feature had disappeared from his Android app, noted that Spotify is “actively exploring a variety of new ways to deliver the best in-car listening experience.” They added that removing car view is necessary to “make way for new innovations.” That’s reasonable enough, though it doesn’t excuse dumping a genuinely useful safety feature without a clear replacement. 

The moderator suggested using Google Assistant (or Siri on iOS) to control Spotify hands-free, something that would also work while navigating with Google or Apple Maps. And, to be fair, that’s how many people (including myself) end up controlling tunes on the road. 

It could be that Spotify is de-prioritizing Car View simply because there are so many other ways to handle music playback in cars. If you’ve got a modern car with CarPlay or Android Auto support, you’ll only be interacting with your in-dash display and will never see Car View in action. Many vehicles made in the last decade also have some sort of media control on their steering wheels.  

Of course, there’s a more nefarious objective, as some Spotify users mentioned in the forum thread. It could be that the company is trying to push people towards Car Thing, its $80 display accessory. We found it to be a useful upgrade for older cars, but it also seemed superfluous when you could just mount your phone and control Spotify directly. Without Car View mode, though, that strange gadget all of a sudden seems more helpful. In cases like this, though, the simplest explanation usually comes down to companies realizing certain features aren’t being used much.

We’ve reached out to Spotify for a full explanation about Car View’s retirement, and will update when we hear back.

Source: Engadget – Spotify’s simplified Car View mode is being ‘retired’