Sunday June 24, 2018
Home Science & Technology A trip past S...

A trip past Sun likely to have selectively altered production of one form of water in a Comet known as Lovejoy

NASA scientists observed the Oort cloud comet C/2014 Q2, also called Lovejoy, when it passed near Earth in early 2015

0
//
66
Comet Lovejoy, Wikimedia
Republish
Reprint

Washington, March 1, 2017: A trip past the sun may have selectively altered the production of one form of water in a comet known as Lovejoy — an effect not seen by astronomers before, a new NASA study suggests.

The findings could shed new light on how much comets might have contributed to Earth’s water compared to asteroids.

“Comets can be quite active and sometimes quite dynamic, especially when they are in the inner solar system, closer to the sun,” said co-author of the study Michael Mumma, Director of NASA’s Goddard Center for Astrobiology.

NewsGram brings to you current foreign news from all over the world.

NASA scientists observed the Oort cloud comet C/2014 Q2, also called Lovejoy, when it passed near Earth in early 2015.

Through NASA’s partnership in the W. M. Keck Observatory on Mauna Kea, Hawaii, the team observed the comet at infrared wavelengths a few days after Lovejoy passed its perihelion – or closest point to the sun.

The team focused on Lovejoy’s water, simultaneously measuring the release of H2O along with production of a heavier form of water, HDO.

Water molecules consist of two hydrogen atoms and one oxygen atom. A hydrogen atom has one proton, but when it also includes a neutron, that heavier hydrogen isotope is called deuterium, or the “D” in HDO.

NewsGram brings to you top news around the world today.

From these measurements, the researchers calculated the D-to-H ratio — a chemical fingerprint that provides clues about exactly where comets (or asteroids) formed within the cloud of material that surrounded the young sun in the early days of the solar system.

Researchers also use the D-to-H value to try to understand how much of Earth’s water may have come from comets versus asteroids.

The scientists compared their findings from the Keck observations with another team’s observations made before the comet reached perihelion, using both space- and ground-based telescopes, and found an unexpected difference.

Check out NewsGram for latest international news updates.

After perihelion, the output of HDO was two to three times higher, while the output of H2O remained essentially constant, showed the findings published online in the Astrophysical Journal Letters.

This meant that the D-to-H ratio was two to three times higher than the values reported earlier.

“If the D-to-H value changes with time, it would be misleading to assume that comets contributed only a small fraction of Earth’s water compared to asteroids,” lead author of the study Lucas Paganini, a researcher with the Goddard Center for Astrobiology, said. (IANS)

 

Click here for reuse options!
Copyright 2017 NewsGram

Next Story

NASA’s Curiosity Rover Captures Images of Martian Dust Storm

The last storm of global magnitude that enveloped Mars was in 2007, five years before Curiosity landed there

0
NASA image.
NASA's Curiosity Rover Captures Images of Martian Dust Storm. Pixabay

With NASA engineers yet to make contact with the Opportunity Mars rover due to a massive storm on the Red Planet, scientists are pinning their hopes on learning more about Martian dust storms from images captured by the Curiosity probe.

As of Tuesday morning, the Martian dust storm had grown in size and was officially a “planet-encircling” (or “global”) dust event, NASA said in a statement on Wednesday.

Though Curiosity is on the other side of Mars from Opportunity, dust has steadily increased over it, more than doubling over the weekend, NASA said.

The US space agency said the Curiosity Rover this month used its Mast Camera, or Mastcam, to snap photos of the intensifying haziness of the surface of Mars caused by the massive dust storm.

For NASA’s human scientists watching from the ground, Curiosity offers an unprecedented window to answer some questions. One of the biggest: Why do some Martian dust storms last for months and grow massive, while others stay small and last only a week?

“We don’t have any good idea,” said Scott Guzewich, an atmospheric scientist at NASA’s Goddard Space Flight Center in Greenbelt, Maryland.

Mars Rover
Mars Rover, Pixabay

Curiosity, he pointed out, plus a fleet of spacecraft in the orbit of Mars, will allow scientists for the first time to collect a wealth of dust information both from the surface and from space.

The last storm of global magnitude that enveloped Mars was in 2007, five years before Curiosity landed there.

The current storm has starkly increased dust at Gale Crater, where the Curiosity rover is studying the storm’s effects from the surface.

But it poses little risk to the Curiosity rover, said Curiosity’s engineers at NASA’s Jet Propulsion Laboratory in Pasadena, California.

Also Read: NASA Plans To Install An Instrument To Monitor Plant Water Use

However, there was still no signal from the Opportunity rover, although a recent analysis of the rover’s long-term survivability in Mars’ extreme cold suggests Opportunity’s electronics and batteries can stay warm enough to function.

Regardless, the project does not expect to hear from Opportunity until the skies begin to clear over the rover.

The dust storm is comparable in scale to a similar storm observed by Viking I in 1977, but not as big as the 2007 storm that Opportunity previously weathered. (IANS)