Not Really – Or Really??

tyson   I found this on Facebook this morning and was surprised not only by what I consider misinformation but also that is supposdly from Neil DeGrasse Tyson, a respected and well liked Science entertainment personality.
   For a clarification the sun does not have enough mass to explode, I guess as in a supernova event. And there is not a companion star losing mass to the surface of the Sun which would lead to a nova event. So while I guess this is an entertaining notion I think it would have made more sense to suggest that if somehow the Sun were to switch off we would not know for 8 minutes or so because at the speed of light it takes about 8 minutes for light from the Sun to reach the Earth. At the end of the 8 minutes it would get dark!
   What I am not too sure about is describing gravity as having speed. I would think that since gravity is universal it is always there – everywhere – not traveling between objects as light or other radiation does. We are able to measure the rate of acceleration due to gravity between objects but is that the same as a speed of gravity?

   
   Click here to go to the Qué tal in the Current Skies web site for more observing information.

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