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These Aren’t Dyson Spheres, They’re HotDOGs

September 23, 2024
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These Aren’t Dyson Spheres, They’re HotDOGs
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If there actually are superior alien civilizations on the market, you’d suppose they’d be simple to seek out. A very highly effective alien race would stride like gods among the cosmos, creating star-sized or galaxy-sized feats of engineering. So moderately than analyzing exoplanet spectra or listening for faint radio messages, why not search for the remnants of celestial builds, one thing too giant and weird to happen naturally?

The most typical concept is that aliens would possibly construct one thing akin to a Dyson sphere. Of their want for extra highly effective vitality sources, a sophisticated civilization would possibly harness the complete output of a star. They wrap a star inside a sphere to seize each final photon of stellar vitality. Such an object would have a strange infrared or radio spectrum. An alien glow that’s faint and distinctive. So astronomers have looked for Dyson spheres within the Milky Means, and have discovered some attention-grabbing candidates.

One main search was often known as Mission Hephaistos, which used information from Gaia, 2MASS, and WISE to have a look at 5 million candidate objects. From this they discovered seven uncommon objects. They look like M-type pink dwarfs at first look, however have spectra that don’t resemble easy stars. This type of star-like infrared object is precisely what you’d count on from a Dyson sphere. However after all extraordinary claims require extraordinary proof, and that’s the place issues get fuzzy.

Virtually instantly after the paper was printed, different astronomers famous that the seven objects may be scorching Mud-Obscured Galaxies, or hotDOGs. These are quasars, so they seem star-like, however are obscured by such an incredible quantity of mud that they principally emit within the infrared. And their spectra could be fairly completely different from a M-type star. So the problem is to differentiate between a hotDOG and a Dyson sphere. Which is the place a brand new paper on the arXiv is available in.

Reasonably than attempting to particularly distinguish between the 2, the authors as a substitute have a look at the distribution of recognized hotDOGS. They discovered that statistically about 1 in 3,000 quasars are of the hotDOG kind, so {that a} broad seek for Dyson spheres would seemingly embrace some dusty quasars. The authors go on to notice that any civilization highly effective sufficient to construct star-scale constructions would even have the power to obscure their infrared sign. We will’t merely assume that aliens would construct a Dyson sphere in such an apparent method. Total, the authors argue, the seven candidate superstructures could be accounted for by hotDOGs and different phenomena, thus there’s at present no clear proof for alien superstructures.

Reference: Suazo, Matías, et al. “Project Hephaistos–II. Dyson sphere candidates from Gaia DR3, 2MASS, and WISE.” Month-to-month Notices of the Royal Astronomical Society 531.1 (2024): 695-707.

Reference: Blain, Andrew W. “Did WISE detect Dyson Spheres/Structures around Gaia-2MASS-selected stars?.” arXiv preprint arXiv:2409.11447 (2024).

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