Smashing Galaxies
http://www.youtube.com/watch?v=qHFEmCggoLA
In the first Astroholic Vlog, I present a soap box talk (minus the box) about merging galaxies.
The Universe in 10 Features: 6. Spiral Galaxies
As we've seen in the previous vlog, spiral Galaxies started forming from the primordial protogalaxies about 11 billion years ago. The formation of spiral galaxies is important because it happened at the peak of population II stars formation and allowed for planets to form.
The Universe in 10 Features: 7. Elliptical Galaxies
Our 7th feature is about elliptical galaxies. Elliptical galaxies are the other main class of galaxies we find in our universe. They have a spherical stellar distribution, meaning simply that their stars' orbits are not in a plane any more, and instead have random orientations.
Astrology is nonsense
https://www.youtube.com/watch?v=vwUJfkrPp90
I've received several questions about astrology and I thought that I could dedicate this vlog to explain why astrology is nonsense.
Astrology is the belief that the apparent position of some astronomical objects in the...
Some facts on Betelgeuse going supernova
Every few months, I see articles about Betelgeuse, the right shoulder in the constellation of Orion, ready to go supernova. The articles vary from the sensational to the apocalyptic and I can understand why it is a fascinating subject. A supernova in our galactic backyard.
From the Earth to the Moon
http://www.youtube.com/watch?v=EHQ2wxq98Wg
In this “out of office” vlog I try to clarify some misconceptions about the distance between the Earth and the Moon, using props and a wonderful animation by Digital Welshman.
The Universe in 10 Features: 9. Protoplanetary disks
Dust to dust, ashes to ashes. In the previous vlog we saw how the cyclical formation and destruction of stars leads to a metal rich Intergalactic Medium, and that the presence of metals in...
The Universe in 10 Features – 2. Cosmic Microwave Background
The cosmic microwave background or CMB is my second feature for this series. The CMB is formed by the original photons produced in the Big Bang and was created at the last scattering surface.
