June 12

JPL Sheds Light on Mysterious Particle Ejections From Asteroid Bennu

first_img Community News faithfernandez More » ShareTweetShare on Google+Pin on PinterestSend with WhatsApp,Virtual Schools PasadenaHomes Solve Community/Gov/Pub SafetyCitizen Service CenterPASADENA EVENTS & ACTIVITIES CALENDARClick here for Movie Showtimes HerbeautyInstall These Measures To Keep Your Household Safe From Covid19HerbeautyHerbeautyHerbeautyShort On Time? 10-Minute Workouts Are Just What You NeedHerbeautyHerbeautyHerbeautyThe Most Heartwarming Moments Between Father And DaughterHerbeautyHerbeautyHerbeautyHe Is Totally In Love With You If He Does These 7 ThingsHerbeautyHerbeautyHerbeauty12 Most Breathtaking Trends In Fashion HistoryHerbeautyHerbeautyHerbeauty6 Strong Female TV Characters Who Deserve To Have A SpinoffHerbeautyHerbeauty Image of asteroid Bennu, surrounded by tiny ejected particles, taken by NASA’s OSIRIS-REx spacecraft on Jan. 6, 2019. The image was created with two photos to show both the asteroid and the particles clearly. (Credit: NASA)Researchers at NASA’s Jet Propulsion Laboratory have gathered some major clues toward solving the interplanetary mystery of why asteroid Bennu constantly ejects tiny pebbles into space, JPL announced Wednesday.Upon arriving at the near-Earth object in late-2019, NASA’s OSIRIS-REx space probe immediately began making unexpected observations, JPL representatives said in a written statement.“Not only was the boulder-strewn asteroid shaped like a rough diamond, its surface was crackling with activity, shedding small pieces of rock into space,” according to the statement. “Now, after more than a year and a half up close with Bennu, they’re starting to better understand these dynamic particle-ejection events.”The findings were published in a collection of studies in a special edition of the Journal of Geophysical Research: Planets.The mystery emerged after cameras aboard OSIRIS-REx noticed that the 1,859-foot-wide asteroid was flinging small rocks into space during a January 2019 survey. While comets are known to become active as their icy contents are melted by the sun, scientists were not expecting to find so much commotion on the surface of an asteroid.One of the new studies, led by JPL Senior Research Scientist Steve Chelsey and titled. “Trajectory Estimation for Particles Observed in the Vicinity of (101955) Bennu,” looked into the unexpected space pebbles in depth.Most are about a quarter-inch across, according to JPL. Some fall back to Bennu under the asteroid’s weak gravity, “sometimes even ricocheting back into space after colliding with the surface.”Some of the particles orbited Bennu for days before falling back down, and others were launched with sufficient force to escape Bennu’s gravity altogether. The particles are ejected at a rate of one or two per day.Chelsey and his team suspected that the ejections may be due to thermal fracturing, as the asteroid rotates and is heated by the sun, small meteoroid impacts, or both. More data was needed to draw a definitive conclusion.As a surprise bonus, scientists found they could monitor Bennu’s gravitational influence on the pebbles in order to get a clearer picture of the asteroid’s gravity field that would have been possible with OSIRIS-REx’s instruments alone, JPL officials said.“The particles were an unexpected gift for gravity science at Bennu since they allowed us to see tiny variations in the asteroid’s gravity field that we would not have known about otherwise,” Chesley said.The tiny pebbles are not believed to pose any danger to OSIRIX-REx, which is intended to land on Bennu in October, then return to Earth with a sample of the asteroid’s material for study in September of 2023.More information about the OSIRIS-REx mission is available at nasa.gov/osiris-rex. Name (required)  Mail (required) (not be published)  Website  Subscribe CITY NEWS SERVICE/STAFF REPORT Pasadena Will Allow Vaccinated People to Go Without Masks in Most Settings Starting on Tuesday STAFF REPORT First Heatwave Expected Next Week STAFF REPORT Pasadena’s ‘626 Day’ Aims to Celebrate City, Boost Local Economy Make a comment EVENTS & ENTERTAINMENT | FOOD & DRINK | THE ARTS | REAL ESTATE | HOME & GARDEN | WELLNESS | SOCIAL SCENE | GETAWAYS | PARENTS & KIDScenter_img 109 recommended0 commentsShareShareTweetSharePin it Your email address will not be published. Required fields are marked * More Cool Stuff Community News Business News Top of the News Get our daily Pasadena newspaper in your email box. Free.Get all the latest Pasadena news, more than 10 fresh stories daily, 7 days a week at 7 a.m. Science and Technology JPL Sheds Light on Mysterious Particle Ejections From Asteroid Bennu By BRIAN DAY Published on Wednesday, September 9, 2020 | 3:14 pm Home of the Week: Unique Pasadena Home Located on Madeline Drive, Pasadenalast_img

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Posted June 12, 2021 by admin in category "eqlauecc

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