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Earth seen from orbit at night. Photo: NASA

The Hubble Space Telescope observed Earth as future tools could one day see a distant, alien planet.

Why it matters: These kinds of analogous experiments using Earth in place of an exoplanet (a world orbiting another star) give scientists a chance to see what a habitable planet may look like through telescopes if one is eventually found.

What they did: Researchers used the Hubble Space Telescope to observe the Earth during a total lunar eclipse, allowing the storied telescope to detect ozone, a gas thought to be key to the evolution of life, in our planet's atmosphere.

  • The scientists behind the observations — detailed in a study due to be published in the Astronomical Journal — used the Hubble to look at light that had been filtered through Earth's atmosphere reflected from the Moon.
  • That allowed the researchers to parse out the makeup of our planet's atmosphere in much the same way as future missions could when observing a planet passing across the face of its star.
  • "We want to make sure we know what the Earth, the only habitable and inhabited planet we know of, looks like using the same methods astronomers use for exoplanets," Allison Youngblood, one of the authors of the new study, told me via email.

What's next: Scientists don't yet have the tools in orbit to confirm the discovery of a habitable planet orbiting a distant star, but future missions could one day confirm another Earth-like planet out there in the galaxy.

Go deeper

Miriam Kramer, author of Space
Oct 20, 2020 - Science

Microsoft and SpaceX partner up to deliver broadband via Starlink satellites


Photo: AaronP/Bauer-Griffin via Getty Images

Microsoft is getting into the space game.

Why it matters: Huge amounts of data pour in from space to Earth each day, and the tech heavyweight sees an opportunity to capitalize on that big data and the growing markets for it.

Updated 2 hours ago - Politics & Policy

Coronavirus dashboard

Illustration: Sarah Grillo/Axios

  1. Health: WHO: AstraZeneca vaccine must be evaluated on "more than a press release."
  2. Politics: Supreme Court backs religious groups on New York COVID restrictions.
  3. Economy: Safety nets to disappear in DecemberAmazon hires 1,400 workers a day throughout pandemic.
  4. Education: U.S. public school enrollment drops as pandemic persists — National standardized tests delayed until 2022.
  5. Cities: Los Angeles County issues stay-at-home order, limits gatherings.
  6. World: London police arrest dozens during anti-lockdown protests — Thailand, Philippines sign deal with AstraZeneca for vaccine.

Tony Hsieh, longtime Zappos CEO, dies at 46

Tony Hsieh. Photo: FilmMagic/FilmMagic

Tony Hsieh, the longtime ex-chief executive of Zappos, died on Friday after being injured in a house fire, his lawyer told the Las Vegas Review-Journal. He was 46.

The big picture: Hsieh was known for his unique approach to management, and following the 2008 recession his ongoing investment and efforts to revitalize the downtown Las Vegas area.