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Astronomy News

What if the Earth Stopped Spinning?

What if the Earth Stopped Spinning?

If Earth stopped spinning all at once, it would be enormously catastrophic for much of the planet’s surface. Though we don’t feel it, we’re all moving along with the planet as it rotates; at the equator, this works out to around 1,000 miles per hour. Stop the planet suddenly, and everything sitting on top of it would go flying eastward. Imagine people, houses, trees, boulders and more being launched sideways at hundreds of miles an hour. In the aftermath, high speed winds, still rotating nearly as fast as the planet, would scour the surface clean.

If the slowdown happened more gradually, the effects would still be dramatic, but would unfold over a longer period of time. The first thing we might notice is that the Sun no longer travels across the sky over the course of a day. The apparent motion of the Sun comes from Earth’s rotation, so if the planet were stationary, it would cause a single day to last half a year long (though we could look forward to some very long-lasting sunsets).
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Without the 24-hour days we’re used to, biological circadian rhythms would be thrown entirely out of whack. The rhythmic cellular processes that tell our bodies when to sleep and when to wake depend in part on regular changes in sunlight to function. Many creatures on Earth, from bees to trees, rely on circadian rhythms to carry out their lives. Changing these cycles could upend normal behavior patterns.

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Astronomy News

Solar Maximum may be early

Space Weather News for April 16, 2021
https://spaceweather.com
https://www.spaceweatheralerts.com

SOLAR CYCLE UPDATE: Solar Maximum might arrive a little sooner than expected. Recent sunspot counts suggest that new Solar Cycle 25 is over-performing compared to official forecasts, and could peak in 2024 instead of 2025. Get the full story @ Spaceweather.com.

Solar Flare Alerts: Would you like a text message while solar flares are underway? Sign up for Space Weather Alerts and never miss another eruption.
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Above: Sunspot counts confirm that Solar Cycle 25 is intensifying and might be running ahead of schedule.

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Astronomy News, Science and technology

China & Russia to build lunar station

China and Russia to build lunar space station

Russian space agency Roscosmos says it has signed an agreement with China’s National Space Administration to develop research facilities on the surface of the moon, in orbit or both.

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A statement from both countries’ space agencies says it will be available for use by other nations.

It comes as Russia prepares to celebrate the 60th anniversary of its first-ever manned space flight.

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Astronomy News

Rover Landing Site Named for Butler

Rover Landing Site Named for Butler

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Octavia E. Butler Landing (by NASA)

NASA has named the landing site of the Mars 2020 Perseverance rover after SF author Octavia E. Butler (1947-2006). The rover was launched from Cape Canaveral FL on July 30, 2020 and landed in Jezero Crater, Mars on February 18, 2021. The mission will spend at least one Mars year (two Earth years) exploring the landing site region.

For more information, see NASA’s website.

Astronomy News

Apophis comes near Earth this weekend

Friday 13th in 2029 will be interesting!I remember when the orbit of Apophis was first calculated, it was thought there might be an impact, the asteroid was going to be that close. It is still a possibility, but not yet. Maybe 2068, for those of us still around to worry about it. –CPL

From Space Weather News for March 8, 2021

ASTEROID APOPHIS FLYBY: Mark your calendar: April 13, 2029. On that Friday the 13th eight years from now, asteroid 99942 Apophis will fly past Earth so close you can see it with your naked eye. No, it won’t hit, but you can be excused a frisson of dread watching it pass by.This weekend, Apophis made a “pre-flyby” of Earth about 16 million km away, the closest it will be before the big event in 2029. Alberto Quijano Vodniza of Pasto, Colombia video-recorded the space rock on March 7th:“I used a 14-inch Celestron telescope to capture these images, which show the asteroid’s motion in about 10 minutes,” he explains.Asteroid Apophis is about 370 meters wide. That’s big enough to punch through Earth’s atmosphere, devastating a region the size of, say, Texas, if it hit land, or causing widespread tsunamis if it hit ocean.Fortunately, Apophis will not hit Earth in 2029. Back in 2004 when the asteroid was first discovered, astronomers thought there might be a collision. Improved observations of Apophis’s orbit have since ruled out a strike. The asteroid will skim Earth’s belt of geosyncronous satellites, but come no closer than 31,900 km to Earth itself. Observations in the past year have reduced the uncertainty of the flyby distance to ±20 km.
Above: Apophis skimming the geosynchronous satellite belt in 2029. Credit: NASAWhat might happen anyway is pretty interesting. At such close range, Earth’s gravity could stretch the asteroid, change the way it spins, and trigger small avalanches. Radar observations during the hours of closest approach will be able to image the asteroid’s surface with few-meter resolution, potentially revealing the changes.Shining like a 3rd magnitude star, Apophis will be plainly visible to the naked eye from rural areas and an easy (albeit fast-moving) target for small telescopes. No one in recorded history has ever seen an asteroid in space so bright.NASA, China, the Planetary Society and others are planning or contemplating missions to Apophis. The more we know about it the better. The next two flybys in 2029 and 2036 are safe, but analysts still haven’t completely ruled out a low-probability impact in 2068.More amateur images of Apophis:from Milan Antos of Jablonec nad Nisou, Czech Republic; from William Wiethoff of Port Wing, Wisconsin; from Robert Forrest of Market Harborough, UK

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Astronomy News

March : most geomagnetically active month of the year

Space Weather News for March 1, 2021
https://spaceweather.com
https://www.spaceweatheralerts.com

GEOMAGNETIC STORM: Did you know, March is the most geomagnetically active month of the year? Today is March 1st and, right on cue, the strongest storm of new Solar Cycle 25 erupted. Bright auroras spread across Canada and Alaska during the G2-class event. Visit Spaceweather.com to find out what makes March so lively.

Instant solar flare alerts: Sign up for Space Weather Alerts and receive a text message when strong solar flares are underway.
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Above: Auroras in bright moonlight over Fairbanks, Alaska, on Feb. 28-March 1, 2021. Photo credit: Ayumi Bakken. Check out our Aurora Photo Gallery!

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Astronomy News, Space Travel / Exploration

It landed-in one piece! Whew!

7 minutes of terror–like Schrodinger’s cat, no one knew if the lander was dead or alive.  What makes Perseverence of particular interest to us is that it’s primary job is to look for signs of life. It will also conduct experiments to make oxygen from the carbon dioxide. This will be critical for a human landing on the planet.

 https://mars.nasa.gov/mars2020/timeline/landing/watch-online/
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Mars is a really busy place right now. There are 18 artificial satellites in orbit, 8 of them active.  https://en.wikipedia.org/wiki/List_of_Mars_orbiters

Astronomy News

Ham radio signals from Mars

Space Weather News for Feb. 17, 2021
https://spaceweather.com
https://www.spaceweatheralerts.com

HAM RADIO SIGNALS FROM MARS: Ham radio operators are doing something that until recently only big Deep Space Networks could do. They’re listening to radio signals from Mars. The “loud and audible” transmissions come from spacecraft orbiting the Red Planet. Some hams are hoping to detect NASA’s Perseverance rover as it touches down later this week. Find out how it’s done on today’s edition of Spaceweather.com.

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Astronomy News

Astronomers want to plant telescopes on the Moon

Astronomers want to plant telescopes on the Moon

The lunar surface offers advantages for infrared and radio astronomy, despite the challenges.

By Ramin Skibba, Inside Science | Published: Tuesday, January 19, 2021

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A group of astronomers now make the case for assembling and planting telescopes on the Moon. In a series of newly published papers, they argue that our lunar neighbor, especially its far side, makes an excellent place for telescopes in the radio and infrared range. These telescopes could discover and study potentially life-friendly planets outside our solar system and explore the little-understood “dark ages” of the young universe, around a million years after the Big Bang, when the first stars formed.

“This is the time to start discussing projects on the Moon. There’s a huge international focus on returning to the Moon, and we wanted to make sure that science gets considered as a priority,” said Joseph Silk, a University of Oxford astrophysicist who authored multiple papers in the series.

Read More Here:

Astronomy News

Two interesting ET stories from Astronomy Magazine

As SF fans, we are naturally drawn to scientific stories about possible alien life. These two stories appeared on the Astronomy Magazine website in December.  The first concerns a signal from Proxima Centauri, the second asks is anyone is looking back at us.   –CPL

Here’s what we know about the signal from Proxima Centauri

The best candidate for an extraterrestrial message in 42 years is probably manmade. But what if it’s not?

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By Robert Naeye  |  Published: Monday, December 28, 2020
Proxima Centauri
Proxima Centauri, our Sun’s nearest stellar neighbor, lies about 4.25 light-years away. ESA/Hubble & NASA
An enigmatic radio signal from the direction of Proxima Centauri, the Sun’s nearest stellar neighbor, has set the internet ablaze with rumor and speculation. It could turn out to be the real deal — a calling card from another civilization. More likely, it’s much ado about nothing.

The discovery was leaked to the British newspaper The Guardian, which reported the story December 18. Researchers subsequently granted interviews to Scientific American and National Geographic. Since then, however, the discovery team has remained tight-lipped about the signal.

But the information revealed to date is intriguing. READ MORE

What would Earth look like to alien astronomers?

A new paper asks which exoplanets could find Earth. Such worlds could be targets for SETI searches.
By Nathaniel Scharping  |  Published: Monday, December 28, 2020
Kepler186fartistconcept
This artist’s concept depicts Kepler-186f, a potentially habitable planet discovered by NASA’s Kepler Space Telescope. NASA Ames/SETI Institute/JPL-Caltech

Ever since 1992, when astronomers first discovered two rocky planets orbiting a pulsar in the constellation Virgo, humans have known that other worlds exist beyond our solar system. Today, thanks to the efforts of astronomers and ambitious missions like the now-retired Kepler, we know of more than 4,000 confirmed exoplanets.

But if we can see exoplanets orbiting distant stars, that means extraterrestrial observers should be able to see Earth orbiting the Sun. Our tiny blue marble even could be on an alien astronomer’s list of rocky exoplanets capable of harboring life.

That’s a speculative scenario, of course, but it’s one astronomers still take seriously. In multiple papers over the years, they’ve identified which exoplanets would be able to spot Earth. And now, with updated information from the European Space Agency’s expansive Gaia catalog of nearby stars, two researchers have provided us with perhaps the best list yet of which alien worlds could have their eyes on us.

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