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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

Updated 41 mins ago - Health

New Zealand aims to create smoke-free generation with tobacco ban

New Zealand Prime Minister Jacinda Ardern at a December news conference in Auckland, New Zealand. Photo: Phil Walter/Getty Images

New Zealand officials announced Thursday legislative plans to outlaw smoking by making it illegal to sell or supply tobacco products to the next generation as part of a lifetime ban.

Why it matters: "People aged 14 when the law comes into effect will never be able to legally purchase tobacco," Associate Health Minister Ayesha Verrall said in a statement announcing the proposed law, part of the Smokefree 2025 Action Plan.

California father and son accused of "reckless arson" in Calder Fire

Firefighters at the Caldor Fire along Highway 89 west of Lake Tahoe, California, in September. Photo: Wally Skalij/Los Angeles Times via Getty Images

California officials said they arrested a father and son Wednesday on suspicion of starting the Caldor Fire, which threatened the Lake Tahoe area as it burned for over two months earlier this year. They deny any wrongdoing.

Why it matters: The wildfire was the 15th-biggest ever recorded in California, razing more than 1,000 structures, forcing thousands to evacuate and injuring five people as it burned across nearly 222,000 acres of land in El Dorado, Amador and Alpine counties.

FDA approves AstraZeneca COVID drug for people with immune problems

Photo: Qilai Shen/Bloomberg via Getty Images

The Food and Drug Administration issued an emergency use authorization for an AstraZeneca COVID-19 antibody drug for people with compromised immune systems.

Why it matters: The drug, Evusheld, is the first antibody therapy authorized in the U.S. to prevent coronavirus symptoms before virus exposure.