How to Watch the Chinese Space Lab Tiangong-1 Plummet to Earth

STR/Getty Images
STR/Getty Images

It won't be a bird or a plane: If you look up to the sky next week, you may see a Chinese spacecraft on one of its last cruises around Earth before it hurtles through our atmosphere and explodes in a fiery hail of debris.

The space lab, called Tiangong-1 ("Heavenly Palace"), was launched by the Chinese space agency on September 29, 2011, Space.com reports. It was the agency's first module to test docking technology, which is essential for bringing astronauts and cargo into space. In its four-and-a-half-year mission, Tiangong-1 successfully docked with one unmanned and two manned spacecraft.

Two years ago, Chinese officials said Tiangong-1 had completed its mission. Relegated to space-junk status, the module began circling the Earth on its slow journey toward oblivion.

Chinese officials say Tiangong-1 is now orbiting Earth every 88 minutes at an altitude of 134 miles, and getting closer to our planet's atmosphere each day. It's expected to fall to Earth sometime between early morning on March 30 and early morning on April 2, with April 1 being the potential sweet spot for skywatchers. (Track its progress here.)

As it tumbles through space, the 34-foot-long craft will appear to flicker with different levels of brightness. But its final destination is anyone's guess. Taingong-1 is predicted to fall anywhere between 42.8° north latitude and 42.8° south latitude—a circumglobal band roughly between the latitudes of Boston, Massachusetts and Christchurch, New Zealand. That target includes about 80 percent of the contiguous United States as well as huge areas of China, Japan, Chile, Argentina, southern Europe, and Australia.

As Tiangong-1 plunges into Earth's atmosphere, it will ignite and break into large chunks before crumbling further. About 10 miles above Earth, the fiery bits—which could still weigh more than 200 pounds—will lose velocity and rain straight down.

As Harvard astrophysicist Jonathan McDowell told The Guardian in 2016, "Yes, there is a chance it will do damage, it might take out someone's car, there will be a rain of a few pieces of metal, it might go through someone's roof, like if a flap fell off a plane, but it is not widespread damage."

Be careful out there.

[h/t Space.com]

A Super Pink Moon—the Biggest Supermoon of 2020—Is Coming In April

April's super pink moon will be extra big and bright (but still white).
April's super pink moon will be extra big and bright (but still white).
jakkapan21/iStock via Getty Images

The sky has already given us several spectacular reasons to look up this year. In addition to a few beautiful full moons, we’ve also gotten opportunities to see the moon share a “kiss” with Venus and even make Mars briefly disappear.

In early April, avid sky-gazers are in for another treat—a super pink moon, the biggest supermoon of 2020. This full moon is considered a supermoon because it coincides with the moon’s perigee, or the point in the moon’s monthly orbit when it’s closest to Earth. According to EarthSky, the lunar perigee occurs on April 7 at 2:08 p.m. EST, and the peak of the full moon follows just hours later, at 10:35 p.m. EST.

How a supermoon is different.

Since the super pink moon will be closer to Earth than any other full moon this year, it will be 2020’s biggest and brightest. It’s also the second of three consecutive supermoons, sandwiched between March’s worm moon and May’s flower moon. Because supermoons only appear about 7 percent bigger and 15 percent brighter than regular full moons, you might not notice a huge difference—but even the most ordinary full moon is pretty breathtaking, so the super pink moon is worth an upward glance when night falls on April 7.

The meaning of pink moon.

Despite its name, the super pink moon will still shine with a normal golden-white glow. As The Old Farmer’s Almanac explains, April’s full moon derives its misleading moniker from an eastern North American wildflower called Phlox subulata, or moss pink, that usually blooms in early April. It’s also called the paschal moon, since its timing helps the Catholic Church set the date for Easter (the word paschal means “of or relating to Easter”).

[h/t EarthSky]

Are Any of the Scientific Instruments Left on the Moon By the Apollo Astronauts Still Functional?

Apollo 11 astronaut Neil Armstrong left the first footprint on the Moon on July 20, 1969.
Apollo 11 astronaut Neil Armstrong left the first footprint on the Moon on July 20, 1969.
Heritage Space/Heritage Images/Getty Images

C Stuart Hardwick:

The retroreflectors left as part of the Apollo Lunar Ranging Experiment are still fully functional, though their reflective efficiency has diminished over the years.

This deterioration is actually now delivering valuable data. The deterioration has multiple causes including micrometeorite impacts and dust deposition on the reflector surface, and chemical degradation of the mirror surface on the underside—among other things.

As technology has advanced, ground station sensitivity has been repeatedly upgraded faster than the reflectors have deteriorated. As a result, measurements have gotten better, not worse, and measurements of the degradation itself have, among other things, lent support to the idea that static electric charge gives the moon an ephemeral periodic near-surface pseudo-atmosphere of electrically levitating dust.

No other Apollo experiments on the moon remain functional. All the missions except the first included experiment packages powered by radiothermoelectric generators (RTGs), which operated until they were ordered to shut down on September 30, 1977. This was done to save money, but also because by then the RTGs could no longer power the transmitters or any instruments, and the control room used to maintain contact was needed for other purposes.

Because of fears that some problem might force Apollo 11 to abort back to orbit soon after landing, Apollo 11 deployed a simplified experiment package including a solar-powered seismometer which failed after 21 days.

This post originally appeared on Quora. Click here to view.

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