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الخميس، 29 مارس 2018

24 Astronomy Facts You Never Learned in School

By Unknown 1:25 م

The sun is bigger than you can even imagine

This image from June 20, 2013, at 11:15 p.m. EDT shows the bright light of a solar flare on the left side of the sun and an eruption of solar material shooting through the sun’s atmosphere, called a prominence eruption. Shortly thereafter, this same region of the sun sent a coronal mass ejection out into space. --- On June 20, 2013, at 11:24 p.m., the sun erupted with an Earth-directed coronal mass ejection or CME, a solar phenomenon that can send billions of tons of particles into space that can reach Earth one to three days later. These particles cannot travel through the atmosphere to harm humans on Earth, but they can affect electronic systems in satellites and on the ground. Experimental NASA research models, based on observations from NASA’s Solar Terrestrial Relations Observatory and ESA/NASA’s Solar and Heliospheric Observatory show that the CME left the sun at speeds of around 1350 miles per second, which is a fast speed for CMEs. Earth-directed CMEs can cause a space weather phenomenon called a geomagnetic storm, which occurs when they funnel energy into Earth's magnetic envelope, the magnetosphere, for an extended period of time. The CME’s magnetic fields peel back the outermost layers of Earth's fields changing their very shape. Magnetic storms can degrade communication signals and cause unexpected electrical surges in power grids. They also can cause aurora. Storms are rare during solar minimum, but as the sun’s activity ramps up every 11 years toward solar maximum – currently expected in late 2013 -- large storms occur several times per year. In the past, geomagnetic storms caused by CMEs of this strength and direction have usually been mild.

When you look up at the sky and see the sun beaming down at you, it’s hard to tell how truly big it is. So consider this: About a million duplicates of Earth could comfortably fit inside of it, according to NASA’s C. Alex Young, PhD. And if the sun didn’t supply our main energy, we’d be shivering in the dark; its core releases energy that is the equivalent of 100 billion nuclear bombs. These quotes from astrophysicist Neil DeGrasse Tyson will blow your mind.

The post 24 Astronomy Facts You Never Learned in School appeared first on Reader's Digest.



from Reader's Digest http://bit.ly/2GG10a0
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