This post is a collaboration with my good friend Bob Wegner, a professional musician, amateur astronomer, and genuinely good person. With the New Horizons spacecraft passing Ultima Thule on New Year’s eve 2019, Bob and I noticed that Queen guitarist and astronomer Brian May was on hand for the live event, playing a newly-written song to mark the event. Bob and I often talk about astronomy, as I’m always interested in his perspective as an enthusiast, while he’s equally interested in my opinion as a professional. We decided to take this event and write about it from two perspectives. For...
Not just the title of an excellent Futurama episode, but now a real place. A planet has been found orbiting in a triple star system, a surprising find that may be more common than once thought. Astronomers from the University of Arizona used the European Southern Observatory (ESO)’s Very Large Telescope (VLT) in Chile to directly image the new planet as it orbits the brightest star in a triple system 320 light years away, in the constellation Centaurus. Orbits like this are thought to be extremely unstable due to the varying gravitational field in the system. “HD 131399Ab is one of the few exoplanets that...
In the early Universe, things were quite different. The first stars were much more massive than stars today, and contained mostly Hydrogen. Astronomers have good ideas about how they formed, but other objects from around this time, namely black holes, are much tougher to account for. Early black holes were huge, with no explanation for how they grew so large. “Early” means “first Billion years after the Big Bang,” but even in that time, it’s hard to determine how observed black holes could grow as large as 100,000 solar masses. I say 100,000 solar masses, because that is the mass of two ‘seed’ black holes, discovered...
If a supernova were to go off somewhere in our galaxy, the minimum safe distance for Earthbound life would be about 50 light years. Any closer than that, and we would experience an intense blast of high energy radiation and an eventual shower of radioactive particles. It would be like nuclear bombs were set off all around the Earth, causing little destruction but a lot of radioactive fallout. Supernovae are incredibly powerful to be able to cause such damage at 50 light years, but even at larger distances, we can see evidence of their effects here on Earth. A team of...
NASA has been zeroing in on certain features of dwarf planet Ceres and looked at them in more detail. Here are the most surprising as well as what we know so far. There are a few other great videos in this playlist, but the first one gives a great summary of what has been seen so far. The most surprising and interesting feature of Ceres in my opinion has been the Occator crater. With the enigmatic bright spots that have been observed since the Dawn spacecraft approached Ceres, we are seeing them in finer detail than ever before, and we...
In the early universe, there was a huge amount of swirling matter and light that didn’t really have much structure. Compared to today’s much more regular dotting of galaxy clusters and superclusters, the early universe was all over the place. But as will all things, there had to be a first. a first star, a first galaxy, and even a first galaxy cluster. The massive cluster of galaxies known as IDCS J1426.5+3508 is the most distant massive galaxy cluster ever discovered, and it has some interesting properties that point to how it formed and evolved so quickly. One such property is...
Twenty years of hunting exoplanets has given us nearly 2000 chunks of non-fusing rock and gas. It’s also given us the statistics to show that the galaxy is likely to be filled to the brim with other worlds, giving incredible potential for finding other Earths and maybe even other life. The latest discoveries involve the use of better technology, more intuitive methods, and more comprehensive searches. This means that we aren’t just discovering planets that are further from Earth, we are finding the ones that are nearby, but small enough to have been hidden, until now. The red dwarf star...
If you look up into the sky on a clear night, you would see thousands of stars. There are surely many more that you would need a telescope to see. But there are not stars everywhere. You can zoom in further and further with bigger and bigger telescopes, until eventually you find gaps where you simply don’t see stars. For a long time it was thought that the gaps were empty, until the Hubble telescope peered through the darkness by taking a 200 hour exposure of a supposedly empty patch of sky. What it revealed was a universe full of...
A few hundred million years after the big bang, the first stars formed. We aren’t exactly sure how, but we do know that they contained Hydrogen, Helium, and a little bit of Lithium. These were the only elements in the entire universe at the time. Within these first stars, the fusion of heavier elements began. Oxygen, Nitrogen, Carbon, Iron, and all the other elements that make up everything we know formed Billions of years ago in these first stars and in their progenitors. It was a slow process to produce these elements and seed them throughout the cosmos, but over...
When I do a planetarium show for an audience, and they see the night sky for the first time, I always ask them ‘What do you see?’ The response is the usual stuff – Stars, the Moon, maybe planets, or the Milky Way. But they seem to be missing the most important and largest part of the sky – the Darkness. Space itself. Stars light up the cosmos, but if there were no stars, would we think that the universe was empty? Perhaps, but if you can imagine this scenario, it gives you an important perspective when you want to...
