قالب وردپرس درنا توس
Home / Science / Chinese space station Tiangong-1 may fall to earth later than expected

Chinese space station Tiangong-1 may fall to earth later than expected



A failed Chinese space station will fall to Earth later than expected due to changes in projected solar activity, predicted the Space Debris Office of the European Space Agency (ESA) in Germany.

An updated ESA forecast released today (March 30) said the 8.5-tonne space laboratory will fall to Earth later on April 1. This is because the activity of the Sun is weaker than expected, the ESA said] The orbit of Tiangong-1 now takes the station very close to the earth's atmosphere. When the sun is more active, charged particles of the solar wind hit the Earth's atmosphere. These particles carry the gases of the earth further into space and increase the gas density at higher altitudes. These gases, in turn, affect the resistance that Tiangong-1

experiences as it circles the earth. [In Photos: China’s Tiangong-1 Space Station]

The stronger the resistance, the faster Tiangong-1 will fall. However, as the activity of the sun is weaker than predicted, the atmosphere did not rise so much. Tiangong-1 will therefore have less drag and slower than expected, ESA said.

  China's first Tiangong-1 space station, shown here in an artist illustration, is expected to fall to earth around April 1, 2018

According to experts

Source: China Manned Space Engineering Bureau

"A High-speed beam of particles from the Sun that was expected to reach Earth and affect the planet's geomagnetic field actually has no effect and calmer space weather around Earth and its atmosphere is now expected in the coming days, "said ESA officials in the forecast.

"This means that the density of the upper atmosphere through which Tiangong-1 moves was not as predicted (which would have required the spacecraft to pull down earlier), and so the ESA Space Debris Office has adjusted the predicted decay rate . "

The ESA emphasized that the reentry window is still variable and uncertain. When the school bus space station falls, it will fall below its current orbit inclination somewhere between 43 degrees north and 43 degrees south latitudes. This trail covers many populated parts of the world, including the United States.

<img class = "pure-img lazy" big-src = "https://img.purch.com/h/1400/aHR0cDovL3d3dy5zcGFjZS5jb20vaW1hZ2VzL2kvMDAwLzA3NS8yOTUvb3JpZ2luYWwvdGlhbmdvbmctMS1yZWVudHJ5LW1hcC1lc2EuanBnPzE1MjIzNjM3NjY=" data-src = "https://img.purch.com/ w / 640 / aHR0cDovL3d3dy5zcGFjZS5jb20vaW1hZ2VzL2kvMDAwLzA3NS8yOTUvaTAyL3RpYW5nb25nLTEtcmVlbnRyeS1tYXAtZXNhLmpwZz8xNTIyMzYzNzY2 "alt =" This map of the European space Agency shows the area in which the Chinese space station Tiangong-1 could fall to the April 1, 2018 (green). [19659005] This card of the European space Agency shows the area, in which the Chinese space station Tiangong-1 could fall around April 1, 2018 (green).

Credit: European Space Agency

The unpredictable case of the station has attracted attention around the world, along with concerns that space debris in structures or people could plunge among them.According to a United Nations contract, liability would be likely lie with China. That is, the chances of someone being hit are vanishingly small; You have a much better chance of winning the Powerball jackpot.

Jonathan McDowell, astrophysicist at Harvard University, told Space.com's sister site Live Science that he predicts only 220 to 440 lbs. (100 to 200 kilograms) Debris from Tiangong-1 will make it onto the planet's surface. "The fireballs are almost certain," said McDowell, a frequent commentator from Tiangong-1, who also works at NASA's Chandra X-Ray Observatory. "What happens is that some dense parts of the lab are connected by a rather thin structure," McDowell added, explaining how the fireballs are made. "The thin structure melts first and turns the lab into a pile – a few to a few dozen, depending on independent pieces that melt and burn slower – fireballs."

There are many examples of satellites or space stations that fall uncontrollably to Earth and create space debris. Probably the most famous is Skylab, a former NASA space station that dropped large pieces in rural Australia in 1979. Skylab, however, was a much larger structure. Its mass was about 100 tons (90.7 tons) or about 10 times more than Tiangong-1.

Tiangong-1 was the first Chinese space station. After its launch in 2011, two crews of Taikonauten (Chinese astronauts) visited the station in 2012 and 2013. China remained in communication with Tiangong-1 by 2016. Since then, the station has slowly sunk to Earth for an inevitable, mortal ( to the spacecraft) encounter with the atmosphere. China also has an active orbiting space station in orbit, called Tiangong-2, which launched in 2016.

Follow us @Spacedotcom Facebook and Google+. Original article on Space.com.


Source link

Leave a Reply

Your email address will not be published. Required fields are marked *