Wikipedia has a pretty awesome list of unsolved problems in physics, which can be read here. A couple of the interesting questions are:
- Is the universe heading towards a Big Freeze, a Big Rip, a Big Crunch or a Big Bounce? Is our universe part of an infinitely recurring cyclic model?
Think of a galaxy, any galaxy. Chances are your intuition guided you to think about a distinct, regular shape - such as a spiral or elliptical galaxy. However, there is a ‘junk draw’ of sorts for galaxies known as the irregular galaxies! Approximately 1 out of every 4 galaxies is irregular. The shape of these is uncommon, as they do not fall into any regular classifications. If the Hubble sequence, a system of classifying galaxies by their shapes, has no category for a particular galaxy’s shape - it is known as irregular. Most irregular galaxies were once spiral or elliptical galaxies but were deformed by disorders in gravitational pull.
There are two major Hubble types of irregular galaxies:
- An Irr-I galaxy (Irr I) is an irregular galaxy that features some structure but not enough to place it cleanly into the Hubble sequence.
- An Irr-II galaxy (Irr II) is an irregular galaxy that does not appear to feature any structure that can place it into the Hubble sequence.
A third classification of irregular galaxies are the dwarf irregulars; they tend to have a low level of metallicity and relatively high levels of gas, and are thought to be similar to the earliest galaxies that populated the Universe.
The amazing, frightening, exotic, and downright beautiful world inside a water droplet. Set to a heart-pumping soundtrack, this one will give you chills.
(by clemento on Vimeo)
Vintage Video of Steve Jobs in 1980 Explaining User Experience.
Neil Degrasse Tyson on Being Agnostic.