American satellite missing for more than 20 years suddenly "reappears"

The missing satellite was found after 25 years of orbiting the Earth without being detected.

According to Space, the Infra-Red Calibration Balloon (S73-7) satellite launched in 1974 disappeared from radar twice, in the 1970s and 1990s, and was only found after 25 years drifting in space.

The S73-7 satellite was launched on April 10, 1974 as part of the United States Air Force's Space Test Program. Its initial mission was to act as a calibration target for remote sensing equipment. However, after deployment, the satellite was unable to inflate and perform this function. It then disappeared from the view of ground monitors.

On April 25, satellite S73-7 was suddenly rediscovered thanks to tracking data from American space scientists. Identifying the satellite is challenging because it has disappeared from radar twice and has a very low radar cross-section. However, scientists used a combination of orbital data and images to confirm that this is satellite S73-7.

A KH-9 Hexagon satellite of the same type as S73-7.

The discovery of satellite S73-7 is an important event for the space science community. It shows the importance of tracking objects in space, especially space debris, which can pose a threat to other satellites and spacecraft.

In fact, the Earth is facing a sky filled with garbage. Because above the atmosphere is the planet's orbit, where space objects "reside", because they are not pulled to the ground and cannot fly out into space. According to a recent estimate by the Russian Space Agency (Roscosmos), there are about 1 million large and small pieces of space junk in this area.

This event also highlights the importance of improving the ability to track objects in space. With more and more satellites being launched into orbit, tracking and managing space debris will become more important.

With the observing power of the James Webb super telescope, the fantasy movie-like world of the "hell planet" Astrolábos is revealed.

Astrolábos, also known as WASP-43b, was discovered in 2011 and was the closest orbiting "hot Jupiter" discovered at the time.

However, what really happens on that mysterious world remains a puzzle, until James Webb's "magic eye" begins peering into deep space from mid-2022, looking deep into the atmosphere of planets. exoplanet.

Watch More Image Part 2 >>>

Exoplanet Astrolábos rotates extremely close to its parent star - Graphic image: PHYS

Hot Jupiters are planets that are equal in size and mass to Jupiter, but orbit too close to their parent star.

In particular, Astrolábos is a perfect opposite version of Jupiter, with the same size but hot as hell because the cycle around the parent star is only 19.2 days.

Astronomer Laura Kreidberg of the Max Planck Institute for Astronomy (MPIA - Germany) and colleagues analyzed detailed James Webb data on this planet, confirming that it is a type of planet that is tidally locked to the star. Mom.

Tidal locking is a phenomenon in which two celestial bodies are so close to each other that their gravitational interaction causes the smaller celestial body to always face a single face toward the larger celestial body.

The closest example is that the Moon always shows Earth people only one side.

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