By Neil deGrasse Tyson
Publish 12 months note: First released in 2006
Loyal readers of the per 30 days "Universe" essays in Natural History journal have lengthy well-known Neil deGrasse Tyson's expertise for directing them during the mysteries of the cosmos with readability and exuberance. Bringing jointly greater than 40 of Tyson's favourite essays, ?Death through Black Hole? explores a myriad of cosmic issues, from what it'd be wish to be within a black gap to the motion picture industry's feeble efforts to get its evening skies correct. one in every of America's best-known astrophysicists, Tyson is a average instructor who simplifies the complexities of astrophysics whereas sharing his infectious fascination for our universe.
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Additional resources for Death by Black Hole: And Other Cosmic Quandaries
It is likely that many more succumbed to processes of erosion. Knowledge of Apollo orbits might make it possible to avoid such collisions in the future. Asteroids also offer the possibility of recovering resources with great economic potential. Some contain great quantities of nickel-iron alloys and other scarce elements; others may yield water, hydrogen, and other materials useful for space-based construction. Estimates of the economic value of a kilometer-sized asteroid reach as high as several trillion dollars.
Impact of even a small asteroid could pose a tremendous threat to human civilization. Throughout the 1990’s and the early twentyfirst century, a number of newly discovered near-Earth asteroids were thought to have a significant chance of hitting Earth in the quite near future. However, in each of those cases, additional observations refined the asteroid’s orbit to the point where it was clear it would not hit Earth after all. There remained one major exception, however. Discovery of the asteroid 99942 Apophis, a member of the Aten group, led to major concern beginning in late 2004 that this 350-meter-across rock had a relatively worrisome potential to impact Earth in 2029.
It successfully reached Eros, and for well over a year NEAR orbited Eros at varying altitudes providing highresolution images of the surface of this S-type asteroid. After completing its primary mission, NEAR gently touched down on Eros on February 12, 2001. A total of 69 high-resolution images of the asteroid’s surface were taken on the way down during a soft-contact landing. The final picture was taken at an altitude of 130 meters and covered an area of 6 meters by 6 meters. Within that final frame was a portion of a 4-meter-wide boulder, as well as evidence of a dusty surface pocked with small rocks and tiny craters.