Bright Sundog

Sunset with bright sundog.

Robbert Dijkgraaf - Video Available on String Theory and the End of Space & Time

The lecture from Robbert Dijkgraaf  "String Theory and the End of Space and Time" is now online. 

What is string theory? What happens to stuff that fall inside a black hole? What are the fundamental building blocks of space and time? Did Nature have any choice in picking the fundamental laws of physics? What is the role of mathematics in physics?

See Youtube video of his lecture https://youtu.be/BuJ5JX1-n4Q

The lecture will also being given on July 13 in Brussels - see this link 

Noctilucent Clouds above Averbode

Last night I walked outside and saw low above the northern horizon Noctilucent clouds. They were very bright but unfortunately very low above my horizon; which is blocked by trees and houses. Still the contrast with other clouds was clearly vissible. When finally getting my camera, the clouds were almost gone. Below some pictures of those "last" moments with low above the horizon the NLC's.
Observation was done after UT 23h30 and pictures taken around UT 23h45. Camera setting up to 6s on ISO1600.

Halo Around the Sun

Too much clouds to observe the Sun in H-Alpha but these are perfect condition for Halo's. Above picture was taken around midtime.

Solargraphy

Two weeks to go to get your pinhole camera ready for Solargraphy.

Sun in H-Alpha with SolarMax3

This morning I was able to take some pictures of the Sun in H-Alpha with Nikon D7500 and SolarMax3 70/400 f/5.7 DS BF15. This time I used barlow x2 and editing was done using CS4.
Pictures shows some filaments (central) and a couple of prominences.

My picture of sunbeams on the cover page

My picture of Sunbeams, taken earlier this week, was choosen to be on the cover of the facebook page "Passie voor Fotografie". Nice recognition.