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NASA’s Mars Perseverance rover lands today. Here’s what to expect | NOVA



House + FlightHouse & Flight

Tuning in to the landing? Right here’s what to anticipate.

An illustration of NASA’s Perseverance rover touchdown safely on Mars. Tons of of vital occasions should execute completely and precisely on time for the rover to land safely on Feb. 18, 2021. Picture Credit score: NASA/JPL-Caltech

In March 2020, at an meeting held on the Lake Braddock Secondary College in Burke, Virginia, Alex Mather’s classmates obtained huge information from NASA.

Mather had submitted a attainable title for the Administration’s latest Mars rover, and this submission—amongst 28,000 obtained by NASA from younger area fanatics—was  “Perseverance.” The night time earlier than his faculty meeting, he discovered his submission had been chosen.

It’s a NASA custom to have children select the names of Mars rovers, Washington Publish’s KidsPost reported in March. Children have provide you with the previous 4: Curiosity, which landed on the crimson planet in 2012; Spirit, which landed in 2004; Alternative, which landed three weeks after Spirit; and Sojourner, which landed on the Fourth of July in 1997.

Now, at roughly 3:55 p.m. EDT on Thursday, Feb. 18, Perseverance will try probably the most difficult—and exact—Mars touchdown in NASA historical past. If all goes easily, the rover will examine Mars’ habitability in an try to find out if life ever took root on Mars. Perseverance, nicknamed “Percy” (many a scientist and science journalist has talked about having trouble spelling “Perseverance”) can even search for indicators of previous life and conduct experiments that examine the opportunity of human exploration.

“Perseverance is NASA’s most bold Mars rover mission but,” Thomas Zurbuchen, affiliate administrator for the Science Mission Directorate at NASA Headquarters in Washington, mentioned in a Feb. 16 press launch. “…the touchdown workforce can have its palms full getting us to Jezero Crater – probably the most difficult Martian terrain ever focused for a touchdown.”

Jezero Crater is a 28-mile-wide hole situated on the western margin of the Isidis Planitia area in Mars’ northern hemisphere. About three billion years in the past, Jezero hosted an almost 820-foot-deep lake, fed by a close-by historic river delta wealthy in mineral sediments. It’s the form of place scientists assume might need supported life. “I feel that must be the hands-down most enjoyable factor that this website has to supply,” Tim Goudge, a planetary scientist and postdoctoral fellow at College of Texas at Austin, advised NOVA in 2018.

Mars orbiters have already spent years gathering data and pictures from 200 miles above Jezero. Pinpointing indicators of historic life would require a better look, nevertheless. That’s the place Perseverance, outfitted with devices that may detect natural matter and measure the composition of rocks and soil, is available in. 

However there’s a hitch: The rover and its companion, the first-ever area helicopter, named Ingenuity, had been constructed by people on Earth, and people are notoriously contaminated. “People are the dirtiest factor in that clear room” the place spacecraft meeting occurs, Moogega Cooper, astronomer and lead of planetary safety for the Mars 2020 Mission, advised NOVA producer Terri Randall. “Now we have all types of microorganisms in our physique and on our pores and skin. And so now we have to guarantee that, from head to toe, and together with our eyes” the spacecraft is protected against human contamination, which might falsely signify life on Mars. 

However Cooper had a better concern, introduced on by the challenges of constructing a rover and conducting a NASA mission throughout a pandemic. “What was most worrying,” she says, “was that off the clock, you may catch COVID. There’s now a vector to wipe out a complete workforce that might utterly derail the mission and throw us off of our scheduled objective.”

Luckily, Perseverance efficiently launched on Jul. 30, 2020 from Cape Canaveral, Florida. Since then, it has flown greater than 290 million miles, zooming via area at 49,290 mph relative to the solar.

Percy’s 17-minute-long entry, descent, and touchdown shall be broadcast on NASA tv, starting with the separation of Perseverance and the Ingenuity Mars Helicopter from the spacecraft’s entry capsule. Subsequent, whereas touring at roughly 12,100 mph, the spacecraft will hit the highest of the Martian ambiance; friction from the ambiance will warmth the underside of the spacecraft to temperatures as excessive as 2,370 F. Moments later, it’s going to deploy its parachute at “supersonic pace,” NASA writes in its Feb. 16 press launch. 

An aeroshell containing NASA’s Perseverance rover guides itself towards the Martian floor because it descends via the ambiance on this illustration. Picture Credit score: NASA/JPL-Caltech

The Perseverance rover will use radar to detect how far it’s from the floor of the crimson planet and a protected touchdown website. As soon as the entry capsule absolutely separates from the rover and its “jetpack,” which is supplied with retrorockets (small auxiliary rockets fired within the course of journey to gradual a craft down), Perseverance will contact down on Mars at 3:55 p.m. EDT.

First, it’ll pop up its head, take footage, and transmit them again to Earth. Engineers can even examine on the rover’s well being throughout its first few days on its new house planet, NASA writes in its press launch. Then, the harder process of figuring out indicators of life and testing expertise designed to provide oxygen from the Martian ambiance (in hopes that the gasoline may very well be used for gasoline—or for people to breathe—on future missions) will start.

If life has existed on Mars earlier than, former astronaut Jeffrey Hoffman tells NOVA, it might be an indication that extraterrestrial life is extra plentiful all through our universe than beforehand thought. However there’s additionally an opportunity that scientists don’t discover any signatures of life on the crimson planet. “And that’ll simply inform us that our one planet is so distinctive and miraculous,” geologist Tanja Bosak says. 

“Perseverance is enjoying a really vital position in our understanding of our place within the universe,” Mars rover engineer Elio Morillo tells NOVA. “And I feel that is very noble.” 

Tune in or stream “On the lookout for Life on Mars” on Wednesday, Feb. 24 at 9/8c on PBS.



Nikon Small World 2021 Photo Competition winners announced today | NOVA



NatureNature

From neurons to tick heads to louse claws, listed below are the highest 10 photographs from the competitors.

The profitable picture of the Nikon Small World 2021 Photograph Competitors exhibits a southern stay oak leaf’s trichomes, stomata, and vessels. Picture Credit score: Jason Kirk, Baylor School of Drugs

The winners of the Nikon Small World Photomicrography Competitors, which goals to showcase “the sweetness and complexity of life as seen by the sunshine microscope,” had been introduced immediately.

That is the forty seventh yr of the photograph competitors, which is open to anybody with an curiosity in microscopy—the usage of microscopes to view samples and objects—and pictures. This yr the competition obtained virtually 1,900 entries from 88 nations. A panel of 5 judges* evaluated the entries for originality, informational content material, technical proficiency, and visible affect, Nikon reported. The outcomes of the sister video competitors, Small World In Movement, had been introduced final month.

Listed below are this yr’s prime 10 photographs:

1. Dwell oak leaf

A southern stay oak leaf’s trichomes, stomata, and vessels photographed by Jason Kirk, an expert imager and core director of Baylor School of Drugs’s Optical Imaging & Important Microscopy Core. Kirk used a custom-made microscope system to take round 200 particular person photographs of the leaf, which he stacked collectively to create this picture, Nikon studies.

Trichomes, stomata, and vessels are all “important to flowers,” Nikon writes. Trichomes, advantageous outgrowths that defend a plant from excessive climate and bugs, are featured in white. “In purple, Jason highlights the stomata, small pores that regulate the circulation of gases in a plant. Coloured in cyan are the vessels that transport water all through the leaf,” Nikon mentioned in a press release.

2. Networking neurons in microfluidic system

Picture Credit score: Esmeralda Paric and Holly Stefen, Dementia Analysis Centre, Macquarie College, New South Wales, Australia

This picture is of a microfluidic system, which accommodates 300,000 networking neurons divided into two remoted populations (left and proper) bridged by axons (heart). The remoted populations had been every handled with a novel virus, Nikon studies. The picture was taken at 40X magnification by Esmeralda Paric and Holly Stefen of Macquarie College’s Dementia Analysis Centre in New South Wales, Australia, utilizing fluorescence imaging, which makes use of high-intensity illumination to excite fluorescent molecules in a pattern. “When a molecule absorbs photons, electrons are excited to the next vitality stage,” Nikon writes. “As electrons ‘calm down’ again to the ground-state, vibrational vitality is misplaced and, in consequence, the emission spectrum is shifted to longer wavelengths.”

3. Rear leg, claw and respiratory trachea of a louse

Picture Credit score: Frank Reiser, Nassau Neighborhood School, New York

A rear leg, claw, and respiratory trachea of a louse, a wingless parasitic insect, at 5X magnification taken by Frank Reiser, a biologist at Nassau Neighborhood School in New York. Reiser used darkfield micrography, which “creates distinction in clear unstained specimens” and “relies on controlling specimen illumination in order that central mild which usually passes by and across the specimen is blocked,” Nikon writes, and picture stacking to provide this picture.

4. Embryonic rat neuron

Picture Credit score: Paula Diaz, Pontificia Universidad Católica de Chile, Santiago, Chile

A sensory neuron from an embryonic rat taken by Paula Diaz, a physiologist at Pontificia Universidad Católica de Chile in Santiago, Chile. Diaz took the picture at 10X magnification and used fluorescence imaging to provide it.

5. Housefly proboscis

Picture Credit score: Oliver Dum, Medienbunker Produktion, Bendof, Rheinland Pfalz, Germany

A proboscis of a housefly (Musca domestica) taken by Oliver Dum of Medienbunker Produktion in Bendof, Rheinland Pfalz, Germany. Dum took the picture at 40X magnification and assembled it utilizing picture stacking.

6. Mouse mind vasculature

Picture Credit score: Dr. Andrea Tedeschi, Wexner Medical Heart, Ohio State College

3D vasculature of an grownup mouse mind taken by Dr. Andrea Tedeschi of Ohio State College’s Wexner Medical Heart in Columbus, Ohio. Tedeschi took the picture at 10X magnification and used confocal imaging, which includes scanning a specimen to create extraordinarily skinny (all the way down to 250 nanometer thickness) computer-generated optical sections utilizing seen mild, to create it.

7. Tick head

Picture Credit score: Drs. Tong Zhang and Paul Stoodley, Ohio State College’s Campus Microscopy & Imaging Facility

Head of a tick taken by Drs. Tong Zhang and Paul Stoodley of Ohio State College’s Campus Microscopy & Imaging Facility in Columbus, Ohio. Zhang and Stoodley took the picture at 10X magnification and used confocal imaging to provide it.

8. Mouse gut

Picture Credit score: Dr. Amy Engevik, Medical College of South Carolina

Cross part of a mouse gut taken at 10X magnification utilizing fluorescence imaging by Dr. Amy Engevik of the Medical College of South Carolina’s Division of Regenerative Drugs and Cell Biology in Charleston, South Carolina.

9. Water flea

Picture Credit score: Jan van IJken, Jan van IJek Images & Movie, Amsterdam, the Netherlands

A water flea (Daphnia) carrying embryos and ciliated vase-shaped protozoans referred to as peritrichs taken at 10X magnification utilizing picture stacking and darkfield microscopy by Jan van IJken of Jan van IJek Images & Movie in Amsterdam, the Netherlands.

10. Butterfly wing

Picture Credit score: Sebastien Malo, Saint Lys, Haute-Garonne, France

Vein and scales on a Morpho didius butterfly wing taken at 20X magnification utilizing picture stacking and mirrored mild pictures by Sebastien Malo of Saint Lys, Haute-Garonne, France.

*NOVA Science Editor Robin Kazmier was a decide on this yr’s competitors.