NASA probe detects likely ‘marsquake’ — an interplanetary first

A life-size model of the spaceship Insight, NASA's first robotic lander dedicated to studying the deep interior of Mars, is shown at Jet Propulsion Laboratory (JPL) in Pasadena, California, U.S. November 26, 2018. (REUTERS)
Updated 24 April 2019
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NASA probe detects likely ‘marsquake’ — an interplanetary first

  • A more distant quake would yield greater information about Mars’ interior because seismic waves would “penetrate deeper into the planet before they come back up to the seismometer,” he said

CALIFORNIA: NASA’s robotic probe InSight has detected and measured what scientists believe to be a “marsquake,” marking the first time a likely seismological tremor has been recorded on another planet, the Jet Propulsion Laboratory in California reported on Tuesday.
The breakthrough came nearly five months after InSight, the first spacecraft designed specifically to study the deep interior of a distant world, touched down on the surface of Mars to begin its two-year seismological mission on the red planet.
The faint rumble characterized by JPL scientists as a likely marsquake, roughly equal to a 2.5 magnitude earthquake, was recorded on April 6 — the lander’s 128th Martian day, or sol.
It was detected by InSight’s French-built seismometer, an instrument sensitive enough to measure a seismic wave just one-half the radius of a hydrogen atom.
“We’ve been collecting background noise up until now, but this first event officially kicks off a new field: Martian seismology,” InSight principal investigator Bruce Banerdt said in a news release.
Scientists are still examining the data to conclusively determine the precise cause of the signal, but the trembling appeared to have originated from inside the planet, as opposed to being caused by forces above the surface, such as wind.
“The high frequency level and broad band is very similar to what we get from a rupture process. So we are very confident that this is a marsquake,” Philippe Lognonné, a geophysics and planetary science professor at University Paris Diderot in France and lead researcher for InSight’s seismometer, said in an email.
Still, a tremor so faint in Southern California would be virtually lost among the dozens of small seismic crackles that occur there every day.
“Our informed guesswork is that this a very small event that’s relatively close, maybe from 50 to 100 kilometers away” from the lander, Banerdt told Reuters by telephone.
A more distant quake would yield greater information about Mars’ interior because seismic waves would “penetrate deeper into the planet before they come back up to the seismometer,” he said.
 
The size and duration of the marsquake also fit the profile of some of the thousands of moonquakes detected on the lunar surface between 1969 and 1977 by seismometers installed there by NASA’s Apollo missions, said Lori Glaze, planetary science division director at NASA headquarters in Washington.
The lunar and Martian surfaces are extremely quiet compared with Earth, which experiences constant low-level seismic noise from oceans and weather as well as quakes that occur along subterranean fault lines created by shifting tectonic plates in the planet’s crust.
Mars and the moon lack tectonic plates. Their seismic activity is instead driven by a cooling and contracting process that causes stress to build up and become strong enough to rupture the crust.
Three other apparent seismic signals were picked up by InSight on March 14, April 10 and April 11 but were even smaller and more ambiguous in origin, leaving scientists less certain they were actual marsquakes.
Lognonné said he expected InSight to eventually detect quakes 50 to 100 times larger than the April 6 tremor.


India to make new bid to launch Moon rocket on Monday

Updated 18 July 2019
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India to make new bid to launch Moon rocket on Monday

  • India would become the fourth nation to land a spacecraft on the moon
  • The project is one of the cheapest amongst its kind internationally

NEW DELHI: India will make a new bid to launch a landmark mission to the Moon on Monday, a week after aborting lift-off at the last minute because of a fuel leak, officials said.
The Indian Space Research Organization (ISRO) said it had rescheduled the launch of Chandrayaan-2, or Moon Chariot-2, for 2:43 p.m. (0913 GMT) on Monday.
India is aiming to become just the fourth nation after Russia, the United States and China to land a spacecraft on the Moon.
Indian space chiefs called off the planned launch of the rocket 56 minutes before blast-off on Monday morning because of what ISRO called a “technical snag.”
Media reports quoted ISRO scientists saying a helium fuel leak had been detected.
India has spent about $140 million on preparations for the project, which is one of the cheapest among international space powers.
By comparison, the United States spent about $25 billion — the equivalent of more than $100 billion in current prices — on 15 Apollo missions in the 1960s and 70s.
The rocket will launch from a space center in Sriharikota, an island off the coast of the southern state of Andhra Pradesh.
It will carry an orbiter, lander and a rover which has been almost entirely designed and made in India.
The orbiter is meant to keep circling the Moon for about one year, taking pictures of the surface and sending back information on the atmosphere.
A lander named Vikram will take the rover to the surface near the lunar South Pole.
India’s first lunar mission in 2008 — Chandrayaan-1 — did not land on the Moon, but carried out a search for water using radar.
A soft landing on the Moon would be a huge leap forward in India’s space program, with Prime Minister Narendra Modi determined to launch a manned mission into space by 2022.
India also has ambitions to land a probe on Mars. In 2014, India became only the fourth nation to put a satellite into orbit around the Red Planet.