Stories tagged space

Jun
24
2011

A star is born: Artist conception of a protostar
A star is born: Artist conception of a protostarCourtesy NASA/Caltech
Scientists have been studying a newly-forming star that’s blasting incredibly hot and gigantic pulses of water from its poles. The extreme temperature at work (180,000 degrees F.) means the water isn’t in liquid form but rather a super-hot concoction of unfused hydrogen and oxygen atoms. As the jet streams shoot into space away from the star’s accretion disk and outer gas cloud, they cool and the atoms interact with dust and each other, and water molecules form as ice.

The protostar, known as L1448-MM, is 750 light years from Earth, and located in the sky near the Pleiades star cluser. Using the European Space Agency’s,Herschel infrared orbiting telescope astronomers are able to measure the elements making up the baby star, and its bizarre behavior. Each powerful jet pulsating from the center of the star shoots “the equivalent of a hundred million times the water flowing through the Amazon River every second”, at a speed of about 120,000 miles per hour. More incredible is the fact that each “pulse” is estimated to last for about a year! Merely a flash of time in cosmic terms.

Each pulse produces shockwave in the surrounding space. Scientists are uncertain of how long the pulsing phase continues during a star’s birth. It could be anywhere from 1 to 10 million years. But astronomers think “water” fountains like that detected on L1448-MM are a common occurrence in the creation of stars, and that our own Sun went through the same process as it was forming.

SOURCE and LINKS
Physorg.com story
European Space Agency
Star formation info
More about L1448-MM

MPCV GTA
MPCV GTACourtesy Lockheed Martin/NASA
Work on the heat shield and thermal protection backshell of the new Multi-Purpose Crew Vehicle (MPCV) ground test article, or GTA, was completed recently in preparation for environmental testing. This image is of the MPCV at the Lockheed Martin Vertical Test Facility in Colorado. The MPCV will undergo rigorous testing to confirm its ability to safely fly astronauts through all the harsh environments of deep space exploration missions.

A major eruption on the Sun on June 7 sent high-energy particles spewing into space. They are expected to reach Earth on the night of Wednesday June 8 (Minnesota time). Astronomers are predicting a major aurora event, with the Northern Lights visible overhead as far south as Milwaukee, and possibly visible on the northern horizon as far south a southern Indiana and Washington DC! For Buzzers in the northern US / southern Canada, if the sky is clear tonight, go out, find a dark place away from city lights, face north and look up. No telescopes or other fancy equipment needed. You can even try to photograph them (use a long exposure, no flash, and set the camera on something steady.) If you get any photos, post them here in the comments.

For more info, and up-to-the-minute predictions, visit the Aurora Forecast page.

May
09
2011

Aerogel
AerogelCourtesy kitchenpantryscientist
When NASA scientists wanted to study star dust (particles from comets and interstellar dust), they had to find a way to slow down the tiny pieces of matter as they flew through space. By the way, interstellar means “between stars.” NASA’s Stardust spacecraft would encounter star dust traveling 6 times the speed of a rifle bullet! At these speeds, a collision with most materials would shatter, or burn up the space dust they were trying to collect.

In order to solve this problem, the scientists at NASA’s Jet Propulsion Laboratory (JPL) in California crafted a special “space jello” called Aerogel which could slow space particle down and trap them, undamaged, for study. Aerogel is similar to glass, but is 1000 times less dense. In fact Aerogel is 99.8 percent empty space. Imagine a box of air filled with tiny, tiny glass threads. When space dust hits this jello-like substance, it makes a tiny tunnel in the aerogel that helps scientists find and collect the dust under a powerful microscope. Then they can study the dust to see what it is made of!

I was luckily enough to get a sample of Aerogel from Stephanie Smith, who works at the Jet Propulsion Laboratory. Aerogel looks like light-blue smoke when you hold it in your hand. It is as light as a feather, but it feels solid, dry, and harder than jello when you touch it! You can read more about Aerogel and the Stardust missions by clicking here, on the JPL website! It’s amazing science. They’ve found many interesting elements and chemical compounds in the star dust already. I can’t wait to see what they find next!

Here’s a video of us playing with the Aerogel Stephanie brought to the NASATweetup! (courtesy of MindspaceLTD)

(This blog post was originally posted on the Kitchen Pantry Scientist blog.)

Apr
19
2011

By Brady Anderson

Growing up as a boy in a small farming community in rural Nebraska one of my favorite things to do was to stare at the night sky. It was always so beautiful. I would often fantasize of traveling from planet to planet to uphold intergalactic peace as a Jedi knight. Among these imaginations I always wondered where all these planets came from. I especially always wondered where the moon came from. Was it really made of cheese? Did a man truly live there? Could a cow jump over it? And was there actually anything worth seeing on its dark side? Well, now that I am older I don’t look at the sky as often as I used too—darn city lights!—but I do still wonder how exactly the moon come about. As it turns out many in the scientific community have also been concerned with this question and over the years there have been a few different theories as to the origin of the moon.

If found some theories about how the moon was formed on the Planetary Science Institute’s website. One theory is that the moon was a planet that was form around the same time as the earth was formed but was pulled into orbit around the earth due to its smaller density. This theory was largely discredited because the moon does not have any iron. The lack of iron is evidence that the moon was not formed from the same process as the earth was because if it was it would contain iron as the earth does. In response to this lack of iron another theory suggested that the moon formed in some other part of the solar system where there was little iron and was then somehow captured into earth’s orbit. This was disproved when lunar rocks were analyzed and showed the same isotope composition as the earth. The fact that they have the same isotope composition gives evidence that the earth and the moon were formed in the same area of the solar system. Another theory suggested that the moon the early earth was spinning so quickly that the moon flung off the earth. However, it has been proven that the angular momentum and energy need for such a thing to happen are impossible given what we know about the size and composition of the earth and moon.

The leading theory of the moon’s origin is an idea put forward by Dr. William K. Hartman and Dr. Donald R. Davis (http://www.psi.edu/projects/moon/moon.html). They proposed that the moon was formed by a body about the size of mars impacting the earth some around 60 million years after the earth’s initial accretion (Earth System History Third Edition, p. 248). Apparently this celestial body blasted into the earth with such speed and impact that some of the mantle of the body was separated to form what is now the moon. The Planetary Science Institute (http://www.psi.edu/projects/moon/moon.html) shows a computer simulation of what the impact probably looked like.

This impact theory explains several facts about the moon and so lend to its probability. First, the moon does not have any water whatsoever. The theory suggests this is so because water and other compounds were expelled from the moon during its formation. Second, the moon has a small metallic core. This is explained by the theory because when the mars sized body impacted the earth its core sank into the earth and became part of its core, but the body’s mantle exploded from it to form the small core of the moon. Third, the moon has a feldspar-rich outer layer. The theory accounts for this because of the heat involved in the impact formation of the moon. The early moon would have had a magma ocean early on much like the early earth (Earth System History Third Edition, p. 248-249).

So there you have it! The moon was most likely formed from an impact of a smaller celestial body on the earth. It was definitely not made of cheese.

Yuri Gagarin in Sweden in 1964
Yuri Gagarin in Sweden in 1964Courtesy Public domain (via Wikipedia)
Fifty years ago today, 27 year-old Soviet cosmonaut Yuri Alekseyevich Gagarin became the first human to be launched into space. On April 12, 1961, Gagarin and the Soviet Vostok-1 spaceship were sent skyward for a 108 minute ride above and around Earth. He made a single orbit around the planet before returning to earth where he received a hero's welcome and became an instant celebrity world-wide. The feat accelerated the so-called Space Race between the Soviet Union and the United States. A mere eight years later, US astronauts Neil Armstrong and Buzz Aldrin became the first humans to walk on the Moon on July 20, 1969. Unfortunately, Gagarin didn't live to see that day, having died the year before in a crash while test-flying a Soviet MiG jet.

Gagarin bio on Wikipedia

Mar
25
2011

Stardust's burn to depletion: On March 24 four rocket motors on NASA's Stardust spacecraft, illustrated in this artist's concept, fired until the spacecraft's fuel was depleted.
Stardust's burn to depletion: On March 24 four rocket motors on NASA's Stardust spacecraft, illustrated in this artist's concept, fired until the spacecraft's fuel was depleted.Courtesy NASA/JPL-Caltech
Yesterday NASA's Stardust spacecraft performed a final burn with its main engines which effectively ended the life of NASA's most traveled comet hunter. Called a "burn to depletion", the procedure will help to answer the question of how much fuel Stardust had left in its tank. While it sounds like running your snow blower until it runs out of gas to store it for the summer, this was an important test as no one has invented an entirely reliable fuel gauge for spacecraft. Part of the process of approximating fuel use is looking at the history of the vehicle's flight and how many times and for how long its rocket motors have fired.

Stardust's burn to depletion is expected to be useful especially because the spacecraft has been proverbially "running on empty" for a long time. Stardust has been in space for over 11 years and has flown past an asteroid (Annefrank), collected particle samples from a comet (Wild 2) and returned them to Earth in a sample return capsule in January 2006. Then, after these primary objectives, it was then re-tasked to perform a flyby of comet Tempel 1, a task it completed last month.

Before the burn to depletion Stardust pointed its antenna at Earth and sent information on the burn as it happened. The command ordering the rockets to fire was sent for 45 minutes, but the burn lasted just 146 seconds. 20 minutes after the engines burned out, Stardust's computer commanded its transmitters to turn off. Without fuel to power the spacecraft's attitude control system, Stardust's solar panels will not remain pointed at the sun. When this occurs, the spacecraft's batteries are expected to drain of power and deplete within hours.

Its a fitting end to a very impressive mission for NASA.

Challenger disaster

by mdr on Jan. 28th, 2011

Crew of the space shuttle Challenger
Crew of the space shuttle ChallengerCourtesy NASA
Twenty-five years ago, on January 28, 1986 the space shuttle Challenger (STS-51L) experienced a catastrophic explosion 73 seconds after liftoff killing all seven astronauts aboard, including teacher Christa McAuliffe. Details of the tragedy can be found here and here.

Jan
27
2011

The great-great-grandfather of galaxies: This could be the oldest object in our universe.
The great-great-grandfather of galaxies: This could be the oldest object in our universe.Courtesy NASA/ESA/Garth Illingworth (UCSC)/Rychard Bouwens (UCSC/Leiden University)/HUDF09 Team
The Hubble Space Telescope has captured what astronomers are claiming is the oldest galaxy in the universe. Here's some of what NASA's Hubble website says about the discovery:

The farthest and one of the very earliest galaxies ever seen in the universe appears as a faint red blob in this ultra-deep–field exposure taken with NASA's Hubble Space Telescope. This is the deepest infrared image taken of the universe. Based on the object's color, astronomers believe it is 13.2 billion light-years away.

The dim object is a compact galaxy of blue stars that existed 480 million years after the Big Bang, only four percent of the universe's current age. It is tiny and considered a building block of today's giant galaxies. Over one hundred such mini-galaxies would be needed to make up our Milky Way galaxy.

Think of that - the light from this object we're seeing now took 13.2 billion years to reach our eyes. That's mind-boggling. We're actually looking back in time. Anyway, the study which appears in the journal Nature, was led by Rychard Bouwens at the Leiden Observatory in the Netherlands, and Garth Illingworth, of the University of California, Santa Cruz. The tiny smudge of light will be further studied and confirmed when the infrared-optimized James Webb Space Telescope is up and running in 2014.

By the way, the Hubble Space Telescope is featured in one of five films at this year's Omnifest playing now through February 17th here at the Science Museum of Minnesota. Take it from me, the images in the film are quite spectacular and worth seeing.

LINKS
A different Hubble info site
Star Tribune story

Aurora alert

by Gene on Dec. 15th, 2010

According to the Aurora Alert mailing list, a solar event on Dec 14th may produce auroral displays (northern lights) starting around midnight tonight, Wednesday 12/15, and continuing Thursday 12/16 and possibly Friday 12/17. Your best bet for seeing the lights -- if they occur -- is to get away from the city, find a dark place with a clear view to the north, and look low on the horizon. Clouds will block your view, so if it's overcast, don't bother.