In the APOD photo from May 14th, it is easy to imagine the rocket launching far away into the galactic disk. Sadly the rocket can’t traverse the thousands of light years to reach the distant stars, and is restricted to orbiting the Earth. Another beautiful part of this image is the technique involved in producing it. It required combining two exposures. The first, with low sensitivity to capture the orange rocket trail of the Falcon 9. The second with high sensitivity and a longer exposure time to capture the faint light of the Milky Way galaxy beyond. The result is...
When we see the Earth’s only Moon up in the sky, we often think about how small it is. It’s only about 1/4 the diameter of the Earth, and at a distance of 384,000 Km, it looks small in the sky. But often size is entirely a matter of perspective. What we compare something to, that’s what determines it’s size. When the Moon is high in the sky we easily compare it to the size of the window we are looking through, or to a nearby tree, or our outstretched hand. All of this can make the Moon seem pretty tiny....
The merger of black holes proven by LIGO yesterday looks amazing in this simulated view in today’s APOD. What would normally take a third of a second has been stretched out to show the entanglement. And remember, these things are far more massive than the Sun, so to be moving this quickly and merging is an extremely high-energy interaction. And kablammo, matter converted to energy, gravitational waves aplenty, and an even bigger black hole. Happy Long Weekend!
Remember the big picture of Andromeda that showed 100 Million stars? That image resulted in a ton of new galaxy discoveries. Most of these new galaxies were once hidden beyond the Andromeda galaxy, but with the super high resolution image, astronomers and the public were able to look straight through and see far more distant objects. Most images of galaxies have what we call ‘field stars’ in them. These are some of the 400 Billion stars of the Milky Way that are far closer than the galaxy we are imaging. For this reason, galaxy images tend to look very cluttered...
I love living in Canada. We have skies that can be free of light pollution with only a short trip outside the cities, and vast areas of land where you can really get away and enjoy the majesty of the cosmos. I occasionally peruse the Canadian made Skynews magazine, and one of my favourite parts is the section where they showcase the work of Canadian astrophotographers. It gives me hope as an amateur astrophotographer myself to eventually get to that level. One of the local Astronomy clubs I visited recently is the North York Astronomical Association, a group of amateur astronomers...
I’ve seen images from the Sun in all different wavelengths of light. It looks very different across the electromagnetic spectrum, with some wavelengths making up more of the Sun’s total energy output than others. What’s always striking to me is seeing the images of the Sun that show its structure, including the strange and beautiful features of plasma that dance across it’s surface. A recent APOD captures just such a concept. This image shows the Sun in Hydrogen Alpha, a wavelength of light at 656 nanometres. This is from the ionization of Hydrogen, where the electron is excited and transitions...
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...
In the last few days, we have watched the intricate dance of Venus and Jupiter in the Western sky after sunset. They have tangoed and passed by one another and the world has watched as the best conjunction of the year has come and gone. Don’t forget that even though they appear close in the sky, Venus is actually closer to the Earth than it is to Jupiter. Jupiter is hundreds of millions of kilometers further away than Venus. Today’s APOD is a beautiful shot by Letian Wang combining the proximity of the two planets with the (much further East...
It’s not fuzzy caterpillars or any small creatures interacting in a Petri dish. The strange growing and twisting creatures are not creatures at all. Today’s NASA APOD shows a time lapse view of a cluster of sunspots as they pass along the surface of the Sun during its rotation. The total time is about 12 hours for the sunspots to cross the solar surface, yet the video is shortened to a quick minute and a half. The amazing thing to notice is the amazing dance of the sunspots as they shift, twist, merge, separate, and interact with the granular convection cells...
When Charles Messier catalogued 100 different objects in the night sky, he couldn’t have imagined the richness and detail of each one of his individual discoveries, or that we would ever see them in such incredible detail as to understand what they truly are and how they evolve. But every time I see a new image of a well-known object, I not only see the new and amazing details revealed, I see the next level of technology that enables us to see it in a new light. This image of Messier number 64 gives me that view. Messier 64 is...
