May 10, 2017

Re-thinking the search for life on Mars

This image from NASA's Mars Reconnaissance Orbiter (MRO) shows the location with the most impressive known gully activity in Mars' northern hemisphere. / NASA

Scientists are re-thinking how to go about finding life on Mars, per a Scientific American dispatch from a recent conference of astrobiologists, geologists and others.

Key takeaways:

  • Maybe we don't have to find life in water. Here on Earth, there are organisms that can survive without water for years and come back to life when conditions are wetter.
  • We may have to drill into Mars to find evidence of past life. Yesterday, astrobiologists reported finding fossils of primitive microbes on Earth in what is today a hot, dry region of Australia that once had hot springs. Mars could have had the same environment in its past.
  • Microorganisms may have traveled between Mars and Earth on meteorites. Robert Hazen told me yesterday it is entirely plausible that life could have arrived here from Mars but, given the Sun's gravitational pull, it is unlikely it traveled the other direction.

Go deeper

CDC: Coronavirus antibodies could give "short-term immunity," but more data is needed

CDC Director Robert Redfield briefs reporters on April 8. Photo: Mandel Ngan/AFP via Getty Images

Coronavirus antibody tests are still relatively unreliable, and it's unclear if people who get the virus are immune to getting it again, the Centers for Disease Control and Prevention cautioned on Tuesday.

What they're saying: The agency explicitly warned against using antibody tests to determine whether someone should return to work or to group people within schools or prisons.

Trump accuses Twitter of interfering in 2020 election

President Trump speaks to the press as he departs the White House in Washington, D.C., on Thursday. Photo: Mandel Ngan/Getty Images

President Trump responded via tweets Tuesday evening to Twitter fact-checking him for the first time on his earlier unsubstantiated posts claiming mail-in ballots in November's election would be fraudulent.

What he's saying: "Twitter is now interfering in the 2020 Presidential Election.They are saying my statement on Mail-In Ballots, which will lead to massive corruption and fraud, is incorrect, based on fact-checking by Fake News CNN and the Amazon Washington Post," the president tweeted. "Twitter is completely stifling FREE SPEECH, and I, as President, will not allow it to happen!"

Coronavirus dashboard

Illustration: Aïda Amer/Axios

  1. Global: Total confirmed cases as of 8:30 p.m. ET: 5,584,091 — Total deaths: 349,894 — Total recoveries — 2,284,242Map.
  2. U.S.: Total confirmed cases as of 8:30 p.m. ET: 1,680,301 — Total deaths: 98,875 — Total recoveries: 384,902 — Total tested: 14,907,041Map.
  3. Federal response: DOJ investigates meatpacking industry over soaring beef pricesMike Pence's press secretary returns to work.
  4. Congress: House Republicans to sue Nancy Pelosi in effort to block proxy voting.
  5. Business: How the new workplace could leave parents behind.
  6. Tech: Twitter fact-checks Trump's tweets about mail-in voting for first timeGoogle to open offices July 6 for 10% of workers.
  7. Public health: CDC releases guidance on when you can be around others after contracting the coronavirus.
  8. What should I do? When you can be around others after contracting the coronavirus — Traveling, asthma, dishes, disinfectants and being contagiousMasks, lending books and self-isolatingExercise, laundry, what counts as soap — Pets, moving and personal healthAnswers about the virus from Axios expertsWhat to know about social distancingHow to minimize your risk.
  9. Other resources: CDC on how to avoid the virus, what to do if you get it, the right mask to wear.

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Updated 49 mins ago - Politics & Policy