Monday May 21, 2018
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NASA Probe Unveils Stormy Environment of Jupiter’s Moon

Jupiter moon Ganymede's environment unique: NASA probe

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NASA's Tiny Satellite Maps Global Ice Couds
NASA's Tiny Satellite Maps Global Ice Couds. Pixabay
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The magnetic field around Jupiter’s moon Ganymede makes it unlike any other in the solar system, shows newly analysed data from NASA’s Galileo spacecraft’s first flyby of the moon two decades ago.

NASA’s Galileo spacecraft spent eight years orbiting Jupiter. During that time, the hearty spacecraft — slightly larger than a full-grown giraffe — sent back spates of discoveries on the gas giant’s moons, including the observation of a magnetic environment around Ganymede that was distinct from Jupiter’s own magnetic field.

The mission ended in 2003, but newly resurrected data from Galileo’s first flyby of Ganymede, detailed in the journal Geophysical Research Letters, offered new insights about the moon’s environment.

“We are now coming back over 20 years later to take a new look at some of the data that was never published and finish the story,” said study lead author Glyn Collinson from NASA’s Goddard Space Flight Center in Greenbelt, Maryland.

Jupiter's dark side.
Jupiter. Pixabay

“We found there’s a whole piece no one knew about,” Collinson said.

In 1996, shortly after arriving at Jupiter, Galileo made a surprising discovery: Ganymede had its own magnetic field.

While most planets in our solar system, including Earth, have magnetic environments — known as magnetospheres — no one expected a moon to have one.

Between 1996 and 2000, Galileo made six targeted flybys of Ganymede, with multiple instruments collecting data on the moon’s magnetosphere.

The new results reveal interesting details about the magnetosphere’s unique structure.

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The results showed a stormy scene. Particles blasted off the moon’s icy surface as a result of incoming plasma rain, and strong flows of plasma pushed between Jupiter and Ganymede due to an explosive magnetic event occurring between the two bodies’ magnetic environments.

Scientists think these observations could be key to unlocking the secrets of the moon, such as why Ganymede’s auroras are so bright.

“There are these particles flying out from the polar regions, and they can tell us something about Ganymede’s atmosphere, which is very thin,” said Bill Paterson, a co-author of the study at NASA Goddard who served on the Galileo Plasma Science (PLS) team during the mission.

“It can also tell us about how Ganymede’s auroras form,” Paterson added.  IANS

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US Senators Want NASA To Extend The ISS Life Until At Least 2028

The aim was to save mony so that more resources could invested into deep space exploration of the Moon and eventually Mars.

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NASA ISS
Representational Image, VOA

NASA should extend the life of the International Space Station (ISS) until at least 2028, two US Senators said in a hearing to examine the future of the orbiting laboratory.

Senator Ted Cruz of Texas who is the Chairman of the Subcommittee on Space, Science, and Competitiveness convened the hearing on Wednesday, which was the first in a series of two hearings to examine the role of the space station.

In its 2019 budget request, the Donald Trump administration proposed ending direct government funding for the ISS by 2025, Florida Today, part of the USA Today network, reported on Wednesday.

“We’ve got this platform up there (worth) north of $100 billion, and it’s there,” Senator Bill Nelson of Florida, ranking member on the Subcommittee on Space, Science and Competitiveness, was quoted as saying.

“Abandoning this incredible orbiting laboratory where they are doing research, when we are on the cusp of a new era of space exploration, would be irresponsible at best and probably disastrous,” Nelson added.

NASA should extend the life of the International Space Station (ISS) until at least 2028, two US Senators said in a hearing to examine the future of the orbiting laboratory.
ISS is a permanent base for astronauts stationed in the outer sky. Wikimedia Commons

The NASA Transition Authorization Act of 2017 directed NASA to develop a plan to transition ISS from the current regime that relies heavily on NASA sponsorship to a regime where NASA could be one of many customers of a low-Earth orbit (LEO) non-governmental human space flight enterprise.

The aim was to save mony so that more resources could invested into deep space exploration of the Moon and eventually Mars.

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The space agency’s internal watchdog on Wednesday, however, said that private companies are unlikely to take on the more than $1 billion annual cost to run the International Space Station by 2025 as NASA hopes.

The report from NASA Inspector General provided a closing argument against the Trump administration’s proposal to privatise or abandon the orbiting laboratory so soon, the US senators said, according to the Florida Today report.

“The defence rests,” quipped Senator Cruz of Texas. (IANS)

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