I started a tradition of making custom science related Christmas cards in my last year of high school. Each year had a theme that was either based on some astronomical or physical phenomenon. At first the cards were distributed digitally only, these days I also print a few dozen of them each year.
- 2018 : The Sun during a coronal mass ejection shaped as Santa. A large CME can contain a billion tons of matter that can be accelerated to several million kilometres per hour in a spectacular explosion.
- 2017 : A Christmas tree shaped sunspot and the Swedish 1-m Solar Telescope
- 2016 : An artistic relresentation of a Chop-Nod reduction as is used in Mid-IR observations to remove the bright sky background and be able to see stars.
- 2015 : A telescope direct imaging an exoplanet with a Christmas tree shaped lens. The image is a real simulation of how a star with a planet would look through a Christmas tree shaped lens.
- 2014 : Curved space-time caused by a very heavy gift.
- 2013 : A Christmas tree depicted by the path of a photon that is being Compton scattered. The color of the right side is slightly different from the left, to show the change in energy/wavelength.
- 2012 : A telescope looking at the Moon, showing us a diffraction limited PSF shaped as a Christmas tree.
- 2011 : Young's double-slit experiment, but with Christmas trees.
- 2010 : A Christmas tree but as a fractal.
- 2009 : Santa but with Pi and a bad (ho)^3 gag.
Last update 24/11/2018 by Alex