Back to Astronomy Cafe by Sten Odenwald

By Sten Odenwald

How briskly does gravity shuttle? whilst will the solar cross nova? Who invented the sunshine 12 months? do we ever trip to the celebs? those are only the various strange and well known questions NASA astronomer Sten Odenwald solutions in again to the Astronomy Caf?, in accordance with his award-winning web site "for the astronomically disadvantaged." given that his acclaimed previous booklet The Astronomy Caf? released in 1998, the gap neighborhood has been became on its head with fullyyt new discoveries: ion propulsion, darkish subject, gravity and magnetic reversals, the Cosmic darkish a long time, and over a hundred new planets. within the all-new again to the Astronomy Caf?, Odenwald solutions the newest and most-asked questions when it comes to those contemporary discoveries. His hugely own and authoritative variety makes knowing the cosmos much less intimidating, intriguing, and fun.Since he opened his web site "The Astronomy Caf?" in 1995, Odenwald has responded 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 background.

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707 X 1,070 = 755 miles per hour. You can use this formula to find the speed of rotation at any latitude. 41 Did Earth spin faster in the past? Well, we can't compare the passage of daytime to any clock that is based on Earth's own movement, so we instead compare a day to the ticking of atomic clocks, which have nothing to do with the Sun, Moon, and stars. 0015 seconds each century. That's why you sometimes hear about a second being added to the calendar on New Year's Eve every few years. Figure 4 shows how this slowdown has affected us since 1964.

The atoms emit light at only a few specific wavelengths, which give auroras their unique colors—blue, red, green. 58 If auroras didn't exist, how would Earth be affected? Auroras are at the top of a complex pyramid of processes in nature. With them gone, some or all of these other processes would also be absent, with very broad impacts to Earth's space environment and the energy input to the upper atmosphere. Their absence would mean that Earth no longer had a magnetic field to protect itself from the full impact of charged particles from the Sun during solar flare events, and from the solar wind.

Loss of ozone means more damaging ultraviolet radiation and increased cancer rates, but not the annihilation of the terrestrial biosphere. 59 During which months can auroras be most easily seen? September and March are the most likely months for auroras, and January and July the least likely. This correlation was described by Jean-Jacques Mairan as long ago as 1733. Solar storms carry magnetic fields as they arrive near Earth. It is generally true that the more a solar wind's field is "south-directed" in polarity, the more vigorously it will transfer energy into Earth's magnetic field.

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