Category Archives: Near Earth Objects

The Luncheon Society/NY Times Best-Selling author Dava Sobel on the importance of Copernicus/San Francisco—Palio D’Asti /November 4, 2011

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How do you propose a new idea when current thinking is so institutionalized and so engrained that anything else would be blasphemous? As he neared the publication of his life’s work, that is what worried Nicolaus Copernicus the most.

Writer Dava Sobel has the ability to compress complex scientific precepts into engrossing reading without dumbing down the subject matter. Her book, Longitudes , continues to be in print long after the date of its first edition.  In fact, Neil Armstrong will write the foreword for the anniversary edition. Her recent book, “A More Perfect Heaven: How Copernicus Revolutionized the Cosmos,” takes us through the challenges the Polish-born cleric encountered as he brought his life’s work to center stage.

We look back at yesterday’s scientific achievements and they are seen as today’s inevitabilities.  It was inevitable that the first flight by the Wright Brothers would lead to Man walking on the surface of the moon. It made logical sense that the discovery of nuclear fission would lead to weaponization within a few short years. 

Yet, when that first flight took place in North Carolina, nobody could envision daily flights to London. When Leó Szilárd first proposed that atoms could be split in 1933 to form nuclear chain reaction, few could calculate the unintended consequences.

 

So when Nicolaus Copernicus suggested that centuries of scientists and mathematicians had it all wrong and that the sun—not the earth—anchored our solar system, he called the basic tenets of civilization into question. Continue reading

The Luncheon Society/Former Apollo Astronaut Rusty Schweickart on the Dangers of Near Earth Asteroids and Objects/Los Angeles—Morton’s Steakhouse/August 4, 2010

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“If you think the night sky is a tranquil place,” former Apollo astronaut Rusty Schweickart says, “consider what may tumble down from the heavens.”

65 Million years ago, a Near Earth Asteroid (NEA) 6 miles in diameter, slammed into the Earth along the Yucatan peninsula, near Chicxulub.  It had the power of a 100 Million megaton nuclear blast (the largest man-made nuclear bomb is only 50 megatons) and over 75% of life on Earth, including the dinosaurs, plants, and other life forms vanished. Life hung by a thread.

The Discovery Channel created a stark video which detailed what would happen if a 500 km NEA crashed into the Earth.

There have been at least 5 ELEs  (Extinction Level Events) during the last 500 million years of Earth’s history, not counting the Big Daddy of them all when a Mars-sized object slammed into a young Earth 4.5 billion years ago.  The collision was so immense that the Earth’s surface melted, was blasted into space and the core was exposed.  Over the next millions of years, the Earth slowly healed. However there is a nightly reminder of what took place; the gravitational pull of the debris coalesced into the current consensus of how the Moon was formed.

These events have happened before and they will most certainly happen again. “We live in a cosmic shooting gallery, Rusty Schweickart noted, “and that being hit by a ‘big one’ is simply a matter of time. We have in our sister planet, the Moon, an excellent history of the visitation record of NEAs and comets to our local neighborhood.” Those craters on the Moon are the results of direct strikes.

Consider this. On Friday April 13, 2029 (yes, Friday the 13th) 99942 Apophis, a Near Earth Asteroid, will pass within 24,000 miles of Earth, just under our geosynchronous satellite field. In astronomical terms, this is an incredibly close call. When first discovered in 2004, there were global concerns that it might hit the planet in 2029 or on its return trip on Easter Sunday 2036.  NASA has since downgraded the strike percentage to 1:233,000 and they will better refine their calculations in 2013 when the orbit of 99942 Apophis next brings it within tracking range. While the NEA is only three football fields in length and no more than 300 meters across, its packs a punch.  If it were to collide with Earth, it would unleash the equivalent of a 510 megaton nuclear blast. Continue reading