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Tectonic activity on the surface of Mars. Photo: NASA/JPL-Caltech/University of Arizona

Mars shakes with quakes more often than scientists initially expected, according to a new series of studies using data from NASA's InSight lander published this week.

Why it matters: Mars looks like a cold, dead world, but its geology is complicated. The InSight lander, which has been studying the Red Planet from its surface since 2018, is giving scientists a fuller picture of the rusty world.

Details: According to NASA, InSight has recorded more than 450 signals from seismic activity so far, with the largest quake measuring in at about 4.0 magnitude.

  • At the end of 2019, InSight was, on average, measuring seismic signals twice per day, according to the agency.
  • The new research shows two relatively strong marsquakes were tracked to the Cerberus Fossae region, where scientists found volcanic activity that may have been responsible for the shakes.
"If you just take a simple model of Mars, you wouldn't expect it to be hot enough inside to be producing magma. So, what it says is that there's probably some variability at depth that the source of which is not obvious at the surface."
— Suzanne Smrekar, an author of the new study, said during a press conference

Be smart: Mars doesn't have plate tectonics the way Earth does. Instead, these quakes are likely caused by volcanic regions shaking the world or the cooling and contracting of the planet itself.

Go deeper: Where to hunt for life on Mars

Go deeper

Kendall Baker, author of Sports
5 mins ago - Sports

College basketball is back

Illustration: Sarah Grillo/Axios

A new season of college basketball begins Wednesday, and the goal is clear: March Madness must be played.

Why it matters: On March 12, 2020, the lights went out on college basketball, depriving teams like Baylor (who won our tournament simulation), Dayton, San Diego State and Florida State of perhaps their best chance to win a national championship.

11 mins ago - World

Scoop: Israeli military prepares for possibility Trump will strike Iran

Defense Minister Benny Gantz attends a cabinet meeting. Photo: Abir Sultan/POOL/AFP via Getty

The Israel Defense Forces have in recent weeks been instructed to prepare for the possibility that the U.S. will conduct a military strike against Iran before President Trump leaves office, senior Israeli officials tell me.

Why it matters: The Israeli government instructed the IDF to undertake the preparations not because of any intelligence or assessment that Trump will order such a strike, but because senior Israeli officials anticipate “a very sensitive period” ahead of Biden's inauguration on Jan. 20.

Wall Street bets it all on a vaccine

Illustration: Eniola Odetunde/Axios

It's the time of year when Wall Street shops are rolling out predictions for where they see the stock market headed in the coming year. There's one common theme: Widespread distribution of a vaccine is the reason to be bullish.

Why it matters: Analysts say vaccines will help the economy heal, corporate profits rebound and stock market continue its upward trajectory.