Astronauts on the ISS to Teach Christa McAuliffe's Lost Science Lessons

NASA
NASA

Christa McAuliffe was set to become the first private citizen to travel to space when she boarded the Challenger space shuttle on January 28, 1986. That dream was cut tragically short when the shuttle exploded 73 seconds after liftoff, killing all seven passengers onboard. Now, 32 years later, part of McAuliffe's mission will finally be realized. As SFGate reports, two NASA astronauts are teaching her lost science lessons in space.

Before she was selected to join the Challenger crew, McAuliffe taught social studies at a Concord, New Hampshire high school. Her astronaut status was awarded as part of NASA's Teacher in Space Project, a program designed to inspire student interest in math, science, and space exploration. McAuliffe was chosen out of an applicant pool of more than 11,000.

Once in orbit, McAuliffe had planned to conduct live and taped lessons in microgravity for her students and the world to see. Though that never happened, she left behind enough notes and practice videos for astronauts to carry through with her legacy 32 years later. On Friday, January 19, astronaut Joe Acaba announced that he and his colleague Ricky Arnold will be sharing her lessons from the International Space Station over the upcoming months. The news was shared during a TV linkup with students at Framingham State University where McAuliffe studied.

McAuliffe's lost lesson plan includes experiments with Newton's laws of motion, bubbles, chromatography, and liquids in space, all of which will be recorded by Acaba and Arnold and shared online through the Challenger Center, a nonprofit promoting space science education.

It will be the first time students will get to see the lessons performed in space, but it won't be the only footage of the lessons available on the internet. Before the doomed Challenger flight, McAuliffe was able to practice her experiments in NASA's famous Vomit Comet. You can watch one of her demonstrations below.

[h/t SFGate]

The Leonid Meteor Shower Peaks This Weekend—Here's the Best Way to See It

NASA/Getty Images
NASA/Getty Images

The Leonid meteor shower will be making its annual appearance in the sky this weekend. As NPR reports, the best time to catch it will be late Saturday night into Sunday morning (November 17-18)—so if you really want to catch this dazzling light show, you may want to drink some coffee to help you stay up.

The waxing gibbous Moon will dull the meteors’ shine a little, so plan to start stargazing after the Moon has set but before dawn on Sunday. (You can use timeanddate.com to figure out the moonset time in your area. The site also features an interactive meteor shower sky map to track visibility conditions.)

If you'll be in parts of the South or Midwest this weekend, you're in luck. Florida, Alabama, Mississippi, Nebraska, and Nevada are expected to enjoy the best view of the Leonids this time around, according to Popular Mechanics.

The Leonids occur every year around November 17 or 18, when Earth drifts across the long trail of debris left behind by the comet Tempel-Tuttle. The comet takes 33 years to complete its orbit around the Sun, and when it reaches perihelion (its closest approach to the Sun), a Leonid storm may occur depending on the density of the comet's existing debris. This sometimes results in hundreds of thousand of meteors streaking across the sky per hour, viewable from Earth. The last Leonid storm occurred in 2001, but Earth may not see dense debris clouds until 2099, according to the American Meteor Society.

This year, if skies are clear and you can secure a secluded spot away from city lights, you might be able to see around 15 to 20 meteors per hour. They travel at 44 miles per second “and are considered to be some of the fastest meteors out there,” NASA says. They’re also known for their “fireballs”—explosions of light and color—which tend to last longer than a typical meteor streak.

[h/t NPR]

Two Harvard Scientists Suggest 'Oumuamua Could Be, Uh, an Alien Probe

ESO/M. Kornmesser
ESO/M. Kornmesser

An odd, cigar-shaped object has been stumping scientists ever since it zoomed into our solar system last year. Dubbed 'Oumuamua (pronounced oh-MOO-ah-MOO-ah), it was first seen through the Pan-STARRS 1 telescope in Hawaii in October 2017. 'Oumuamua moved at an unusually high speed and in a different kind of orbit than those of comets or asteroids, leading scientists to conclude that it didn't originate in our solar system. It was the first interstellar object to arrive from somewhere else, but its visit was brief. After being spotted over Chile and other locales, 'Oumuamua left last January, leaving lots of questions in its wake.

Now, two researchers at Harvard University bury a surprising suggestion in a new paper that analyzes the object's movement: 'Oumuamua could be an alien probe. Sure, why not?

First, astrophysicists Shmuel Bialy and Abraham Loeb argue that 'Oumuamua is being driven through space by solar radiation pressure, which could explain its uncharacteristic speed. But for that theory to work, they calculate that the object must be unusually thin. Bialy and Loeb then analyze how such a slender object might withstand collisions with dust and gases, and the force of rotation, on its interstellar journey.

Then things get weird.

"A more exotic scenario is that 'Oumuamua may be a fully operational probe sent intentionally to Earth vicinity by an alien civilization," they write [PDF]. They suggest that ‘Oumuamua could be be a lightsail—an artificial object propelled by radiation pressure—which also happens to be the technology that the Breakthrough Starshot initiative, of which Loeb is the advisory committee chair, is trying to send into space. "Considering an artificial origin, one possibility is that 'Oumuamua is a lightsail, floating in interstellar space as a debris from an advanced technological equipment,” they write.

Their paper, which was not peer-reviewed, was posted on the pre-print platform arXiv.

Loeb is well known for theorizing about alien tech. He previously suggested that intense radio signals from 2007 could be the work of aliens who travel through space on solar sails. However, Loeb acknowledged that this theory deals more with possibility than probability, The Washington Post noted. “It’s worth putting ideas out there and letting the data be the judge,” Loeb told the paper last year.

[h/t CNN]

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