Archive for July 18, 2016

07/18/2016 – Ephemeris – A second gravitational wave detection and new thoughts about dark matter

July 18, 2016 Comments off

Ephemeris for Monday, July 18th.  Today the Sun will be up for 15 hours and 8 minutes, setting at 9:22, and it will rise tomorrow at 6:15.  The Moon, 1 day before full, will set at 6:04 tomorrow morning.

A couple of weeks ago a second gravitational wave event was reported.  This one was detected on December 26th last year.   Scientists determined that it came from the collision of a 14 and a 8 solar mass black holes resulting in a 21 solar mass black hole with one solar mass loss as gravitational wave energy.  The event happened 1.5 billion light years away.  Some scientists at NASA are speculating that, since no particles with the exotic properties of dark matter have been discovered that this matter might be primordial black holes, created at the time of the Big Bang itself.   These primordial black holes can also help solve some other problems of the evolving early universe.

Times are for the Traverse City/Interlochen area of Michigan. They may be different for your location.


Dec 26, 2015 gravitational wave event

Gravitational wave signal in blue of the December 26, 2015 detection of the second gravitational wave event.