Apr 13, 2020 11:34 PM
https://www.wired.com/story/nasa-wants-t...exoplanet/
INTRO: It wasn’t that long ago that the only known planets in our galaxy were those orbiting our own sun. But over the past few decades, astronomers have discovered thousands of exoplanets and concluded that they outnumber the stars in our galaxy. Many of these alien worlds have fantastic properties such as planet-wide oceans of lava or clouds that rain iron. Others may have conditions strikingly similar to Earth. We’ll never be able to travel to these distant worlds to see for ourselves, but an audacious mission to interstellar space may allow us to admire them from afar.
Last week, NASA’s Innovative Advanced Concept program announced its new cohort of scientists who will spend the next year developing space mission concepts that sound like they were plucked straight from science fiction. Among this year’s NIAC grants are proposals to turn a lunar crater into a giant radio dish, to develop an antimatter deceleration system, and to map the inside of an asteroid. But the most eye-popping concept of the bunch was advanced by Slava Turyshev, a physicist at NASA’s Jet Propulsion Laboratory who wants to photograph an exoplanet by using the sun as a giant camera lens.
It’s an idea based on a century-old theory first floated by Albert Einstein, who calculated that a star’s gravity would cause light from another star to bend around it, effectively creating a giant lens. If you were to stand at the focal region where the bent light converges, the “solar gravitational lens” would significantly magnify whatever was behind the star. Einstein’s theory about gravitational lensing is now a well-established fact. Observational cosmologists regularly use the gravitational lensing from galaxies and galaxy clusters to study more distant objects.
Turyshev’s plan would take advantage of this effect by sending a telescope on a 60-billion-mile journey to the sun’s focal region to photograph a habitable, Earth-like exoplanet that is up to 100 light years away. He calculates that sending a telescope just one-third the size of the Hubble Space Telescope to the sun’s focal region could produce a megapixel-quality image of an exoplanet after a few years of snapping photos. If the targeted exoplanet is about the size of Earth, each pixel would cover 35 square kilometers. Turyshev says that would be better resolution than the famous “Earthrise” photo taken by Apollo 8 astronauts and more than enough definition to make out surface features and any signs of life on the exoplanet’s surface... (MORE)
RELATED (older plan): Fast Outgoing Cyclopean Astronomical Lens
INTRO: It wasn’t that long ago that the only known planets in our galaxy were those orbiting our own sun. But over the past few decades, astronomers have discovered thousands of exoplanets and concluded that they outnumber the stars in our galaxy. Many of these alien worlds have fantastic properties such as planet-wide oceans of lava or clouds that rain iron. Others may have conditions strikingly similar to Earth. We’ll never be able to travel to these distant worlds to see for ourselves, but an audacious mission to interstellar space may allow us to admire them from afar.
Last week, NASA’s Innovative Advanced Concept program announced its new cohort of scientists who will spend the next year developing space mission concepts that sound like they were plucked straight from science fiction. Among this year’s NIAC grants are proposals to turn a lunar crater into a giant radio dish, to develop an antimatter deceleration system, and to map the inside of an asteroid. But the most eye-popping concept of the bunch was advanced by Slava Turyshev, a physicist at NASA’s Jet Propulsion Laboratory who wants to photograph an exoplanet by using the sun as a giant camera lens.
It’s an idea based on a century-old theory first floated by Albert Einstein, who calculated that a star’s gravity would cause light from another star to bend around it, effectively creating a giant lens. If you were to stand at the focal region where the bent light converges, the “solar gravitational lens” would significantly magnify whatever was behind the star. Einstein’s theory about gravitational lensing is now a well-established fact. Observational cosmologists regularly use the gravitational lensing from galaxies and galaxy clusters to study more distant objects.
Turyshev’s plan would take advantage of this effect by sending a telescope on a 60-billion-mile journey to the sun’s focal region to photograph a habitable, Earth-like exoplanet that is up to 100 light years away. He calculates that sending a telescope just one-third the size of the Hubble Space Telescope to the sun’s focal region could produce a megapixel-quality image of an exoplanet after a few years of snapping photos. If the targeted exoplanet is about the size of Earth, each pixel would cover 35 square kilometers. Turyshev says that would be better resolution than the famous “Earthrise” photo taken by Apollo 8 astronauts and more than enough definition to make out surface features and any signs of life on the exoplanet’s surface... (MORE)
RELATED (older plan): Fast Outgoing Cyclopean Astronomical Lens