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Home NASA

Might we flip the solar into a big telescope?

September 15, 2024
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Might we flip the solar into a big telescope?
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We now have some extremely highly effective telescopes which have given us spectacular views of the cosmos and allowed us to look again to the early days of the universe. These observatories, such because the James Webb House Telescope (JWST), are wonderful feats of engineering which have required billions of {dollars} and a long time of labor. 

However what if we may entry an excellent higher telescope that already exists? This would not be a typical telescope. It would not even include a lens. However it will be by far essentially the most highly effective telescope we would ever constructed.

This telescope would use the solar itself.

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To offer some perspective on how highly effective a sun-based telescope might be, think about JWST. With a mirror that is 21.3 ft (6.5 meters) in diameter, JWST is able to attaining a decision of round one-tenth of an arcsecond, which is about 600 occasions higher than the human eye. At that decision, the telescope may see the small print on a coin positioned 25 miles (40 kilometers) away from it or choose up the sample of a regulation soccer ball sitting 342 miles (550 km) away.

Associated: 12 James Webb House Telescope findings that modified our understanding of the universe

One other instance is the Occasion Horizon Telescope, which can be a community of particular person devices scattered throughout the globe. By fastidiously coordinating its components, the telescope has given us spectacular pictures of the disks of fuel surrounding large black holes. To realize that, it managed a formidable decision of 20 microarcseconds. At that decision, the telescope may spot an orange sitting on the floor of the moon.

However what if we needed to go even larger? A bigger telescope would wish both gigantic dishes or networks of antennae flying by the photo voltaic system, each of which might require huge leaps in our technological capabilities.

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Fortunately, there simply so occurs to be an enormous telescope already accessible, sitting proper within the middle of the photo voltaic system: the solar.

Whereas the solar could not appear to be a standard lens or mirror, it has a number of mass. And in Einstein‘s idea of normal relativity, huge objects bend space-time round them. Any mild that grazes the floor of the solar will get deflected and, as a substitute of continuous in a straight line, heads towards a focus, along with all the opposite mild that grazes the solar on the similar time.

An illustration demonstrates how the use of gravitational lensing around a star might aid long-distance communication.

An illustration demonstrates how the usage of gravitational lensing across the solar may work. (Picture credit score: Dani Zemba/Penn State, CC BY-NC-ND 4.0)

Astronomers already use this impact, referred to as gravitational lensing, to review essentially the most distant galaxies in the universe. When mild from these galaxies passes close to an enormous cluster of galaxies, the mass of that cluster amplifies and magnifies the background picture, permitting us to see a lot farther than we usually may.

The “photo voltaic gravitational lens” results in an virtually unbelievably excessive decision. It is as if we had a telescope mirror the width of all the solar. An instrument positioned on the right point of interest would be capable to harness the gravitational warping of the solar’s gravity to permit us to look at the distant universe with a jaw-dropping decision of 10^-10 arcseconds. That is roughly one million occasions extra highly effective than the Occasion Horizon Telescope.

In fact, there are challenges with utilizing the photo voltaic gravitational lens as a pure telescope. The focus of all this mild bending sits 542 occasions larger than the distance between Earth and the solar. It is 11 occasions the distance to Pluto, and thrice the space achieved by humanity’s most far-flung spacecraft, Voyager 1, which launched in 1977.

So not solely would we’ve to ship a spacecraft farther than we ever have earlier than, but it surely must have sufficient gasoline to remain there and transfer round. The pictures created by the photo voltaic gravitational lens can be unfold out over tens of kilometers of house, so the spacecraft must scan all the discipline to construct up an entire mosaic picture.

Plans to benefit from the photo voltaic lens return to the Seventies. Most lately, astronomers have proposed creating a fleet of small, light-weight cubesats that may deploy photo voltaic sails to speed up them to 542 AU. As soon as there, they might decelerate and coordinate their maneuvers, build up a picture and sending the information again to Earth for processing.

Whereas it might appear outlandish, the idea is not too removed from actuality. And what would we get with this sort of supertelescope? If it have been geared toward Proxima b, the closest recognized exoplanet, for instance, it will ship a 1-kilometer decision. Contemplating that plans for successors to JWST hope to realize imaging capabilities of exoplanets the place all the planet sits in a handful of pixels, the photo voltaic gravitational lens places these concepts to disgrace; it is able to delivering an beautiful portrait of the detailed floor options of any exoplanet inside 100 light-years, not to mention all the opposite astronomical observations it may obtain.

To say this may be higher than any recognized telescope is an understatement. It will be higher than any telescope we may presumably construct in any doable future for the following few hundred years. The telescope already exists — we simply must get a digital camera in the proper place.



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