Honestly this could be the name of a new TV show, similar to ‘when buildings collapse,’ or ‘here’s what Kim Kardashian did today.’ I’ll take the colliding galaxies, simply because they can hold my attention longer. Galaxy collisions are some of the most massive and long term events in the universe. The result is the formation of billions of stars, the change in orbit of Billions more, and the complete restructuring of a galaxy. Since we see a snapshot of the Universe whenever we look at a single galaxy, we tend to see collisions happening at all stages of the...
If you have ever seen the Andromeda Galaxy, M31, in the sky or through a telescope, you’ll find it’s reminiscent of a small blurry, fuzzy patch, almost like a cloud. The cloudy look is similar to looking at the hazy white glow of the milky way’s concentrated disk. But that cloudy view is not all of M31. The galaxy is so far away, around 2.5 Million light years, that you’re only seeing the concentrated light from its central bulge. You’re actually missing a large portion of the galaxy because its just too dim for your eyes to see. If you can take a...
As we are approaching the New Horizons bypass of Pluto just over a month from now, there is a lot of focus on the Plutonian system, from its strange Moons to its enigmatic surface. As we wait for the first ever high resolution images of the surface of Pluto, we can look to Hubble data to give us our fix. The best image of Pluto taken up to today, by Hubble, is blurry and at best can lead us to speculation about what we are seeing. But Hubble, as always, produces valuable science, and has given new insights into the...
Today is a busy day in the world of astronomy and space news. The US Air Force has approved SpaceX for military launches, ending a ten year monopoly by Boeing and Lockheed-Martin. A black hole jet moving at nearly the speed of light is having traffic issues, resulting in knots of jet material rear-ending each other. An experiment in Quantum Mechanics has shown that reality simply doesn’t exist until we measure it. Finally, the Gemini planet imager has found a bright, disk-shaped ring of dust around the star HD 115600, which is being likened to the Kuiper Belt in the...
We are fairly confident about the idea that the Moon formed when a Mars sized object hit the young Earth over 4 Billion years ago. The resulting debris cloud condensed to form the Moon, giving the Earth a surprisingly large Moon for its size. Next to Charon and Pluto, the Earth’s Moon is the largest relative to the size of its planet. It’s also the third largest of all moons in the Solar System, next to Ganymede and Titan, #1 and #2 respectively. but there is one problem with this theory of the Moons formation: The Earth and Moon are...
This Galaxy, NGC 7714, has an odd shape. In fact we call it a ‘Peculiar Galaxy.’ Why doesn’t it have the characteristic spiral arms if it is indeed a spiral? Why doesn’t it look more diffuse and football shaped like an elliptical galaxy? The reason is that like millions of other galaxies in the Universe, it has recently collided with a nearby companion galaxy. Now using the term ‘collided’ is not really accurate. In reality the two galaxies are interacting via gravity. During a ‘collision,’ stars in the interacting galaxies don’t physically hit each other. The galaxies are incredibly large,...
A vast number of Galaxies in the Universe have a central black hole that is incredibly massive. The Black Hole at the centre of the Milky Way, dubbed Sag A*, is estimated to have a mass as high as three Million Suns. We generally can’t see black holes, but when they start to pull in matter from surrounding gas and dust clouds, the material forms a disk around the star. This accretion disk can heat up to incredible temperatures and emit X-rays and other high energy light, allowing us to see where the black holes are. Sometimes the light from...
When I do Planetarium shows, one of the things I like to talk about during the Milky Way – Andromeda collision that will happen in 70 Mlllion years, is the fact that very few stars will actually hit each other. Yet we still call it a ‘Galaxy collision.’ One of the questions I always get is “Will the Earth survive this?” I usually ask the audience. The response is usually a unanimous ‘No way!” And then I tell them how big Galaxies are and they can’t believe how unlikely it is that the solar system will be affected. Consider the...
