Mars rover Curiosity test fires the laser – pulverizes a rock just for fun (and science)

Johnny Five, aka the Mars rover Curiosity, continues its scientific journey. The nuclear-powered laboratory in-a-box pulled out it’s laser to blast a rock that got in its way 보약같은 친구. From NASA:

The mission’s ChemCam instrument hit a fist-sized rock named “Coronation” with 30 pulses of its laser during a 10-second period 다운로드. Each pulse delivers more than a million watts of power for about five one-billionths of a second.

The energy from the laser creates a puff of ionized, glowing plasma 다운로드. ChemCam catches the light with a telescope and analyzes it with three spectrometers for information about what elements are in the rock.

 

NASA said the main function of this was target practice to calibrate the ChemCam 다운로드.

You gotta love the sense of play NASA is bringing to this mission. Not only are they releasing these stories about test-firing lasers, but they are all over social medial, including fan art on Facebook, a first-person Twitter account, sharing stories on Google Plus, and posting articles on their much more user-friendly website 편의점 이력서 다운로드.

A great idea for the much beleaguered space agency, that I assume is a bid to get them back into America’s good graces…and taxpayer dollars epson 드라이버.

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Continue reading Mars rover Curiosity test fires the laser – pulverizes a rock just for fun (and science)

Astronomers discover a star-creating galaxy that sheds light on the galactic cooling problem

Massive galaxy cluster spawns more than 700 stars a year

A newly discovered cluster of galaxies, more than 5 billion light years from Earth…is among the most massive clusters of galaxies in the universe, and produces X-rays at a rate faster than any other known cluster 다운로드.

It also creates new stars at an “unmatched” pace of more than 700 per year, said Michael McDonald. “This extreme rate of star formation was unexpected,” he said during a NASA news conference Wednesday, noting that the Milky Way forms just one or two stars a year 컴퓨터 바탕화면 다운로드.

In addition to being massive, unique, and the biggest star-nursery in the universe, this area, called Phoenix, also helps theorists with something, the galactic cooling problem 다운로드.

 

Phoenix Cluster: a combination of the X-ray, Optical, and Ultraviolet images, left; artists concept of the central galaxy, right 고양이마리오. (photo: NASA)

 

For years scientists have been coming up with explanations for how stars are formed 다운로드. The earliest being a mass of molecules would collapse in on themselves as fusion begins. The mass would then accumulate until its gravity becomes strong enough to spin, turn into a sphere, and pull on everything around it, collecting planets, asteroids, and other debris into its solar system 2019년 달력 한글 다운로드.

But, this doesn’t take into account thermodynamics, specifically why doesn’t the star expand as it heats up. Indeed, several half-stars were observed in the universe stuck in this state of expansion unable to contract into the ultra-compact ball of a star 다운로드.

That’s where a new theory comes in, the galactic “cooling flow”.

**There appears to be no name for the theory, all references are to a general theory theory of star formation 자백 14 다운로드.

This says the creation of stars is a lot like an explosion, with an initial burst of heat which then dissipates bringing cool air back into the explosion zone 앵무새 다운로드. In this case, thermonuclear fusion ignites much of the galaxy and begins sucking into the center lots of mass, including the surrounding galaxies.

As the (star) forms, this plasma initially heats up due to the gravitational energy released from the infall of smaller galaxies 여신의 키스 다운로드.

As the gas cools, it should condense and sink inward, a process known as a “cooling flow.” 

In the cluster’s center, this cooling flow can lead to very dense cores of gas, termed “cool cores,” which should fuel bursts of star formation in all clusters that go through this process. Most of these predictions had been confirmed with observations – the X-ray glow, the lower temperatures at the cluster centers – but starbursts accompanying this cooling remain rare. – TG Daily

 

A step forward in our knowledge of star formation, but something tells me we are not there yet.

Continue reading Astronomers discover a star-creating galaxy that sheds light on the galactic cooling problem