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NASA's Perseverance rover launches on trip to Mars

NASA's Perseverance rover launched on a journey to Mars Thursday to hunt for signs of past alien life on the Red Planet.

Why it matters: The rover is the third spacecraft lofted to Mars this month, with the first two sent by the United Arab Emirates and China.

Details: The car-sized rover launched atop a ULA Atlas V rocket at 7:50 a.m. ET from Cape Canaveral, Florida.

  • The rover is now separated from the top of the rocket and is on its way to Mars.

The big picture: Once Perseverance makes it to its landing site in Jezero Crater in about seven months, the rover will set out on a mission to investigate interesting rocks for possible signatures of biology and life.

  • Scientists think the area of Mars that Perseverance will investigate is actually the remnant of an ancient lake and delta rich in deposits that might help preserve signs of life.
  • The rover's instruments will record sound, take photos and use a laser to analyze the chemical compositions of interesting rocks the rover comes across.
  • Perseverance will also cache small samples of rock and dirt in tubes to one day be delivered back to Earth on a future robotic mission.

Some fun things: Perseverance is carrying 10.9 million names submitted by people to the Red Planet etched into three silicon chips.

  • The rover also comes equipped with a plate honoring the first responders on the frontlines of the novel coronavirus pandemic.
  • And a small helicopter called Ingenuity is hitching a ride to Mars to prove out new technology for future missions.

What's next: China's Mars mission, the UAE's Hope orbiter and Perseverance are all expected to make it to the Red Planet in February.

  • The three missions, all designed to perform different tasks to piece together Martian history, will help contribute to a more holistic picture of our cosmic neighbor.

Go deeper: The end of the beginning of Mars exploration

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Why the startup world needs to ditch "unicorns" for "dragons"

When Aileen Lee originally coined the term "unicorn" in late 2013, she was describing the 39 "U.S.-based software companies started since 2003 and valued at over $1 billion by public or private market investors."

Flashback: It got redefined in early 2015 by yours truly and Erin Griffith, in a cover story for Fortune, as any privately-held startup valued at $1 billion or more. At the time, we counted 80 of them.

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Scoop: Facebook's new moves to lower News Feed's political volume

Facebook plans to announce that it will de-emphasize political posts and current events content in the News Feed based on negative user feedback, Axios has learned. It also plans to expand tests to limit the amount of political content that people see in their News Feeds to more countries outside of the U.S.

Why it matters: The changes could reduce traffic to some news publishers, particularly companies that post a lot of political content.

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Scoop: Amazon quietly getting into live audio business

Amazon is investing heavily in a new live audio feature that's similar to other live audio offerings like Clubhouse, Twitter Spaces and Spotify's new live audio platform, sources tell Axios.

Why it matters: As with Amazon's efforts in podcasting and music subscriptions, the company sees live audio as a way to bolster the types of content it can offer through its voice assistant, Alexa, and its smart speaker products.

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Hurricane Ida exposes America's precarious energy infrastructure

The powerful hurricane that plunged New Orleans into darkness for what could be weeks is the latest sign that U.S. power systems are not ready for a warmer, more volatile world.

The big picture: “Our current infrastructure is not adequate when it comes to these kinds of weather extremes,” Joshua Rhodes, a University of Texas energy expert, tells Axios.

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"We must go further": 70% of adults in European Union are fully vaccinated

About 70% of adults in the European Union are fully vaccinated against COVID-19, Ursula von der Leyen, the president of the European Commission, said Tuesday.

Why it matters: The milestone makes the E.U. one of the world's leaders in inoculations, after an initially lagging vaccine campaign, the New York Times notes.

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What Elizabeth Holmes jurors will be asked ahead of fraud trial

Jury selection begins today in USA v. Elizabeth Holmes, with the actual jury trial to get underway on Sept. 8.

Why it matters: Theranos was the biggest fraud in Silicon Valley history, putting both hundreds of millions of dollars and thousands of patients' health at risk.

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