Showing posts with label Asteroids. Show all posts
Showing posts with label Asteroids. Show all posts

Thursday, April 17, 2008

Who's Right? NASA or the 13 year old boy?

Looks like NASA did get it right! The story of an enterprising 13-year-old German boy, and his great feat in recalculating the likelihood of an asteroid hitting Earth which the Aeronautics and Space Administration (NASA), the big American space agency acknowledged as being correct spread like a disease through the internet. It may seem incredible and unbelievable - and that's because it is.

Officials from both NASA and the European Space Agency did a re-examination and found that the kid was in fact, not correct, and the ESA swear blind they never said any different. One ESA spokesperson says "A small boy did do these calculations, but he made a mistake... NASA's figures are correct."

It seems that the initial article in the Potsdamer Neueste Nachrichten, which says that NASA and the ESA endorsed Nico Marquardt's calculations, was incorrect. The story spread like wildfire, and before it could be corrected, it had already made its way into countless articles. (Including one of our own)

Marquardt apparently calculated that the odds of the well-known Apophis asteroid hitting Earth were not one in 45,000 as assessed by NASA, but rather one in 450. It seems that Marquardt's calculations included the possibility of collision with a satellite in some way not thought to have been covered by NASA, which bumped up the odds of a subsequent Earth strike.

Contrary to earlier press releases, NASA denies having been proven wrong by the boy, claims that they were not contacted, and have had no correspondence to the boy.

Apophis will pass close by Earth in 2029 and 2036, so close that it will come nearer than satellites in geostationary orbit. However, according to NASA, it is not a big threat:
"[The asteroid will pass] within the distance of Earth's geosynchronous satellites. However, because Apophis will pass interior to the positions of these satellites at closest approach, in a plane inclined at 40 degrees to the Earth's equator and passing outside the equatorial geosynchronous zone when crossing the equatorial plane, it does not threaten the satellites in that heavily populated region."

So, all of you people out there who thought the boy proved NASA wrong about the asteroid collision chances, here's big news! You may have seen our earlier post "NASA proved wrong by a 13 year old school boy", and yes this was basically the article that spread across the Internet. Now we know that NASA was right, and the German Kid was wrong.

The chances of the asteroid hitting Earth is still quite low then. In all, it appears that the Apophis asteroid won't devastate Earth after all.

Wednesday, April 16, 2008

NASA proved wrong by a 13 year old school boy

UPDATE: Please go to "Who's Right? NASA or the 13 year old boy?" to see the final outcome.

German schoolboy, Nico Marquardt, corrected NASA's estimates of the chance that an asteroid (Apophis) may collide with Earth.
He used telescopic findings from the Institute of Astrophysics in Potsdam (AIP) to calculate that the chance of Apophis the Asteroid will collide with Earth is 1 in 450.
Previously, NASA had estimated the change to be at about 1 in 45,000, but confirmed later that the kid was right.

How did the kid manage better than NASA? He took in the chances of the Asteroid possibly colliding with one of Earth's 40,000 orbiting satellites. If the asteroid were to strike a satellite in 2029, then its trajectory path would be altered, can will strike Earth in the next orbit in 2036.
Both NASA and Marquardt claim that the asteroid, if collided with Earth, would become a ball of iron and iridium 320 wide, weighing 200 billion tons as it hits Earth in the Atlantic Ocean. This would creating enormous tsunami waves, destroying coastlines, creating a huge dust cloud, and cause much destruction.

Apparently, this discovery was made for a science competition named "Apophis - The Killer Asteroid."

Let's just hope that Asteroid doesn't actually hit Earth.

Sunday, April 6, 2008

The Begining of Life

Life began on Earth billions of years ago and has evolved greatly to the present date. We have wondered for a long time how life came to be. We're already gotten some clues when comets were examined and we found that they had similar amounts of the chemicals that make up humans (Nitrogen, Oxygen, Hydrogen, and Carbon). Ronald Breslow, Ph.D., University Professor, Columbia University, and former ACS President, described how our amino acid signature came from outer space. Firstly, chains of amino acids make up the protein in people and life. There are two forms of amino acids: the left and the right, which mirror the other in much the same way human's left and right hands mirror each other.
This is known as "chirality." In order for life to arise, proteins must contain only one chiral form of amino acids, left or right, as noted by Ronald Breslow.

"If you mix up chirality, a protein's properties change enormously. Life couldn't operate with just random mixtures of stuff," he said.
On Earth, left handed amino acids dominate. Breslow explained how this compusition of amino acids came to be: as asteroids fly past stars in space, one type of amino acid is destroyed. Stars emit polarized light circularly and thus, on one side, it emits right-polarized light, and on the other, it emits left-polarized light.
Previous experiments have proven have circularly polarized light destroys one type of amino acid over the other, causing an excess of about 5-10% over the other. Asteroids begin with an equal amount until they are affected by this light. In this case, the L-amino acid was the excess.

There has been much proof indicating this L-amino acid domination in experiments and instances of finding meteorites where they had an excess of L-amino acids on the surface. The professeur showed how L-amino acids could become dominant with an experiment starting with a 5% extra of one the L-amino acid and disolving it in water. As the amino acids combined and the water evaporated, it left a huge dominance of L-amino acids and it was chosen selectively by living organisms.

There have been other theories put forth but the evidence behind this theory is overhwelming.
With this discovery, we are closer than ever before, to discovering how life begins and the fact that there could very well be other life on Earth.