On the road to finding other Earths
Scientists are getting closer to finding worlds that resemble our own "blue marble" of a planet. NASA's Kepler mission alone has confirmed more than 1,000 planets outside our solar system—a handful of which are a bit bigger than Earth and orbit in the habitable zones of their stars, where liquid water might exist. Some astronomers think the discovery of Earth's true analogs may be around the corner. What are the next steps to search for life on these potentially habitable worlds?
|This illustration shows the prototype starshade, a giant structure designed to block the glare of stars so|
that future space telescopes can take pictures of planets [Credit: NASA/JPL]
A new JPL "Crazy Engineering" video (above) visits both technologies at NASA's Jet Propulsion Laboratory in Pasadena, California:
"Coronagraphs are like visors in your car—you use them to block the light of the sun so you can see the road," said Nick Siegler, the program chief technologist for NASA's Exoplanet Exploration Program Office at JPL. "Starshades, on the other hand, are separate spacecraft that fly in front of other telescopes, so they are more like driving behind a big truck in front of you to block the light of the sun." Siegler is featured in the Crazy Engineering video.
The starshade would be a large structure about the size of a baseball diamond that deploys in space and flies in front of a space telescope.
Coronagraphs, which use tiny masks to block the light of stars from within a telescope, are also currently in development at JPL, as part of NASA's Wide-Field Infrared Survey Telescope, or WFIRST, mission, led by NASA's Goddard Space Flight Center in Greenbelt, Maryland.
Source: NASA [April 29, 2016]