By Sten Odenwald
The main sought-after "answer guy" for astronomy takes us on an all-new day trip to the continuously interesting, often sobering, international of the deep cosmos looking for solutions to renowned questions.How quick does gravity go back and forth? while will the sunlight cross nova? Who invented the sunshine 12 months? can we ever trip to the celebrities? those are only many of the strange and well known questions NASA astronomer Sten Odenwald solutions in Back to the Astronomy Café, in line with his award-winning web site "for the astronomically disadvantaged."Since his acclaimed prior publication The Astronomy Café released in 1998, the gap group has been became on its head with fullyyt new discoveries: ion propulsion, darkish topic, gravity and magnetic reversals, the Cosmic darkish a while, and over a hundred new planets. within the all-new Back to the Astronomy Café, Odenwald solutions the most recent and most-asked questions in relation to those fresh discoveries. His hugely own and authoritative type makes realizing the cosmos much less intimidating, fascinating, and fun.Since he opened his site "The Astronomy Café" in 1995, Odenwald has replied over 50,000 e-mailed questions. His person solutions were downloaded over 7.5 million instances, making him the main sought-after "answer guy" for astronomy in human history.
__________Автор, признанный авторитет в области космоса, предлагает читателю совершить экскурсию в волнующий мир дальнего космоса в поисках ответов на распространённые вопросы. С момента выхода в свет нашумевшей книги "Астрономическое кафе" в 1998 году космическое сообщество было поставлено с ног на голову совершенно новыми открытиями: ионным двигателем, темной материей, гравитационными и магнитными инверсиями, космическими "тёмными веками" и более a hundred новых планет. В своей новой книге "Обратно в астрономическое кафе" автор отвечает на последние и наиболее часто задаваемые вопросы, связанные с этими недавними открытиями. Его крайне доверительный и уверенный стиль делает понимание космоса менее пугающим и более захватывающим и весёлым.
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By various accounts there are over 100,000 objects larger than 1/2 inch that have been tracked by NORAD in orbits that are mostly below 1,200 miles. Some of this material travels at speeds of up to 30,000 miles per hour. These include the debris from over 130 rocket and satellite explosions. In October 1999, the International Space Station had to be moved out of the way of a piece of orbiting junk that was headed right for it. Similar maneuvers have also taken place with the space shuttle. 50 Why is the sky blue?
61 What would Earth be like without a moon? It would be pretty grim. In 1993, Jacques Laskar and his colleagues working at the Bureau des Longitudes in Paris performed extensive computer modeling of Earth's axis. What they turned up was that the Moon stabilizes the tilt of Earth's rotation axis so that we can have mild seasons with no extreme swings. Without the Moon, the gravitational torques from the Sun and other planets would cause the axis to wander and tip to extreme angles, even 90 degrees so that for a time it would roll on its side like Venus or Uranus.
Since 1998, astronomers have narrowed down our uncertainty for this important number so that a value from 13 to 15 billion years is the most likely age. Astronomers are accustomed to quoting numbers in terms of ranges, but it has always been rather awkward to explain why we can't seem to know this number with, say, the same accuracy that we know the mass of the Sun, or the distance from the Sun to the center of the Milky Way. This all changed on February 11, 2003, when the Wilkinson Microwave Anisotropy Probe (WMAP) reported the results from its first-year's measurements of the cosmic microwave background.