Happy International Year of the Periodic Table, everyone! We’re celebrating 150 years since Mendeleev brought some order to the unruly mess of the elements of matter, organising all of the types of atoms into a system sorted by physics and chemistry: rows of increasing number of protons in the nucleus; columns of similar chemical properties due to the orbiting electrons. This week, Emily takes us through the Astronomer’s version of the table, which really only has three bits to it: Hydrogen, which is almost everything; Helium, which is almost everything else; and the rest, which is just called “metals”.
Saturn. There's no denying, it's gorgeous. And for 13 years the Cassini-Huygens spacecraft, a joint mission by NASA, the ESA and the ASI, orbited the ringed planet, sending back stunning images of the rings, the many moons and moonlets, and the planet surface, as well as copious data that has changed astronomers understanding of Saturn and its system. Some of that data, released recently, shows that those iconic rings aren't as massive as once thought — which also implies they're not terribly old either, and could disappear in a few hundred million years. On a cosmic time scale, blink and you miss them! We're lucky to be here to witness Saturn's magnificence.
We're back for 2019! Welcome to another year of awesome astronomy. In this episode we chat about the Super Wolf Blood Moon (a.k.a. "January-lunar-eclipse-that-was-slightly-bigger-than-average") and the lunar meteorite impacts caught on video during the eclipse. Then Emily gets pretty excited about the First Light data from TESS, everyone's favourite exoplanet-hunting spacecraft — and describes the first three exoplanets found amongst the TESS data. Turns out, all exoplanets are indeed exciting.
Emily went back to New Zealand for Christmas. Chris is in Yorkshire. One of them is surrounded by summer sunshine and Middle-Earth mountains. One of them ... isn't. Emily reports from the final day of her observing run on what it's like being an actual, real-life astronomer, before descending from the peak to enjoy the silly season in the antipodes. Whatever your flavour of December celebrations, we at Syzygy wish you a happy one — and a great start to 2019, another year full of astronomical awesomeness.
The Earth and the Sun and all the other planets feel like familiar friends who've been around forever. Wind the clock back a few billion years though, and things were very different. The infant Sun was prone to highly energetic tantrums, the gas giants were acting like thugs and throwing their weight around, and the rocky planets were just trying to gather enough dust and ice in one place to actually stay in one piece. It's not clear at all how we got from such a chaotic, violent early solar system to the relatively tranquil place we call home today. Fortunately, Emily's here with the latest models and theories to clear it all up for us.
Ever since early humans gazed in wonder at the majesty of the night sky, astronomy has been a particularly visual science. Modern astronomers deal in vast quantities of data, measuring the cosmos with visible light and invisible neutrinos, x-rays and cosmic rays, radio waves and gravity waves. Yet its the glorious images of astronomy — the planets, nebulae and galaxies — that capture our minds and fuels our imaginations. In this episode we discuss what makes astrophotography so important, and Emily lists her Top 4 mind-blowing cosmic images.
There are a lot of galaxies in the universe — billions and billions of them, in fact. And many of them are in the process of collision: some collided long ago, some are merging right now, and some will slam together in the distant future. When they collide, the supermassive black holes in their cores can collide and merge too — and that's a pretty extreme event. Studying how fast these mergers take place is changing astronomers’ models of galaxy formation and evolution.
A very special live event from YorNight 2018, the University of York's celebration of research at beautiful King's Manor. We talked about exoplanets — that is, planets around other stars — and Emily shared her top three exoplanets of all time. Chris finished by strapping on a guitar and going all Chris Hadfield with The Exoplanet Song. A wonderful, enthusiastic audience of young and old (many in astro-themed fancy dress for the occasion!) packed out the theatre, asked brilliant questions and cheered along.
We've been so comfortable throwing around facts like "the Sun is 8 light seconds away" and "the nearest star is 4 light years away", it's easy to forget that measuring cosmic distances isn't as simple as pulling out a tape measure. So how *do* you measure how far it is to the moon, or the next star, or a distant galaxy? Emily gives us her top five rungs on the Cosmic Distance Ladder.
Mercury: closest planet to the Sun, a small, uninteresting lump of rock ... or, an enigma, with a strange tidally-locked orbit, a core that's way too big, and a mysterious origin story that astronomers are slowly piecing together. Which is why it's Emily's favourite planet, and why ESA and JAXA are sending the fabulously-named BepiColombo spacecraft to take a closer look.