Gallery: Real threats from space

Here's the size of the Earth compared to a normal solar flare that occured in March 2010. Fortunately, we're 93 million miles away from the sun so the odds are very much in our favor.

The 1859 super flare is called the "Carrington event" after English astronomer Richard Carrington who was studying sunspots when "blinding white light" suddenly appeared over them in a kidney shape. See his diagram above. 

The next day, telegraph offices reported sparks flying that caused some fires, and in some places electrical currents kept the equipment operating even after the batteries were disconnected. Auroras could be seen all over the planet, even in tropical latitudes such as Hawaii. Some were so bright that newspapers could be read at night.

Solar flares are a very common occurance. This one in 2006 damaged the X-ray Imager, which took this image, onboard NOAA's GOES-13 satellite. The Carrington event was most likely much brighter.

In 1989 a solar flare caused geomagnetic storms that shut down the power system in Quebec for 9 hours.

Here is a solar flare that occured on June 7, 2011.

This amazing aurora was a byproduct of the solar flare as seen in the previous image.

Here's a solar flare from February 2011.

This solar flare is from December 2010.

Both NASA and the National Oceanic and Atomspheric Administration (NOAA) operate sites that track space weather. Here is an image from the sun on June 27 that shows a "coronal hole." A solar wind from this hole should reach Earth on July 1 or July 2.

There is only one sunspot right now with no threat of a solar flare according to NASA.

Imagine my surprise upon visiting NASA's spaceweather .com, when I read that asteroid 2011MD was going to fly by the Earth within an hour. Upon further review, it is only about 10 meters wide and should pass about 7,500 miles away - actually not that far. If you're reading this, we must be OK.

This asteroid is just one of 1,237 potentially hazardous space rocks being tracked. The miss distance is tracked by LD which is the distance from the Earth to the moon. 2011 MD came within 0.05 LDs of the Earth. From that perspective, wow.

The space weather forecast for June 27 from the NOAA Space Weather Prediction Center.

Here's a chart of sunspots over the past few years. There actually have been many less than usual.

Xrays from space are tracked on a continual basis.