Astronomy Cast Ep. 599: Zodiacal Light by Fraser Cain & Dr. Pamela Gay Pamela has told us in the most flowery terms about the diffuse dust across the inner solar system left over from the formation of the inner planets. well, it turns out she was wrong. Super wrong. Time to update!
Astronomy Cast Ep. 598: How You Could Overturn Cosmology by Fraser Cain & Dr. Pamela Gay You've probably heard of dark matter and dark energy, but maybe you don't fully understand what they are. Or maybe the idea itself just rubs you the wrong way and you'd like to know why scientists think they can just make stuff up like this. So you'd like to overturn cosmology? Here's all you need to do.
Astronomy Cast Ep. 597: The Expansion of the Universe by Fraser Cain & Dr. Pamela Gay It's been a while since we checked to make sure the Universe was still expanding. Yeah, apparently, that's still a thing. But in the last few years powerful new telescopes and expansive surveys have given us much more knowledge about what's happening. Especially at the earliest times.
Astronomy Cast Ep. 596: The Universe’s Background Noise by Fraser Cain & Dr. Pamela Gay You might be familiar with the cosmic microwave background, but that's just one of the background radiations that astronomers look at. Some are well known and cataloged. While others are just starting to be possible to see at all. All of them tell us more about our Universe.
Astronomy Cast Ep. 595: Planet Hunting - Revisited by Fraser Cain & Dr. Pamela Gay This is gonna be another one of those evergreen topics where we come back again and again. Finding planets. Every time we talk about this now it seems like we've gained thousands of new planets. Well, buckle up! New techniques will grow that by tens of thousands and even millions!
Astronomy Cast Ep. 594: Juno - Primary Mission Highlights by Fraser Cain & Dr. Pamela Gay Pamela is always loath to talk about spacecraft until the mission's in space and the science is rolling. NASA's Juno Mission just received a mission extension, adding Jupiter's moons to the menu. Now, finally, we can talk about Juno! [Ed. Juno what I mean?]
Astronomy Cast Ep. 593: Stellar Parasites by Fraser Cain & Dr. Pamela Gay Stars often come in groups of 2 or more. And if they're orbiting close enough to each other one star can feast on the other and when that happens, well, mayhem ensues!
Astronomy Cast Ep. 592: Gamma-Ray Bursts - Updated by Fraser Cain & Dr. Pamela Gay Some of the most powerful explosions in the Universe are gamma-ray bursts, capable of blasting a beam of death half way across the galaxy. In just the last few years astronomers have discovered a tremendous amount about these blasts and what's actually causing them. The answer, of course, is that it's more complicated than we originally thought. The old Gamma-Ray bursts show:
Astronomy Cast Ep. 591: What Are We Gonna Do With All That Space Junk? by Fraser Cain & Dr. Pamela Gay Remember the good old days when there were only a few thousand living and dead satellites? Well, those days are long over. We're now entering an era where there will be tens of thousands of satellites. Not to mention the spent rocket boosters and other space junk. What kind of risk do we face and what can be done about it?
Astronomy Cast Ep. 590: Lunar Hazards: Dust, Radiation and More by Fraser Cain & Dr. Pamela Gay 2024 can't come soon enough. You know, that's the year when humans will set foot on the Moon again. Now don't you roll your eyes! That's the plan. Unless the plan changes. But my point is, explorers going to the Moon will need to be concerned about all kinds of hazards, like dust, radiation and gigantic Moon worms. I believe.
Astronomy Cast Ep. 589 - Lunar Resources: Water (Update) & Other Volatiles by Fraser Cain & Dr. Pamela Gay We've talked about the Moon and its water many times here on Astronomy Cast, but there've been a bunch of big updates thanks to new research from NASA and others. Today we're gonna give you an update on the state of water on the Moon and the plans to take advantage of it.
Astronomy Cast Ep. 588 - Lunar Resources: Lava Tubes by Fraser Cain & Dr. Pamela Gay All eyes are on the Moon. We're going back, this time to stay, right? One of the best resources on the Moon will be the lava tubes that criss-cross the subsurface of the Moon. These can provide protection from space, and a look at the geologic history of the Moon, and they can be enormous!
Astronomy Cast Ep. 587: The Artemis Accords by Fraser Cain & Dr. Pamela Gay So the Moon is about to become a very busy place with multiple countries and private companies planning missions in the next few years. It's been decades since the Outer Space Treaty was negotiated. It's time for the Artemis Accords!
Astronomy Cast Ep. 586: Life As We Know It: Habitable Exoplanets & Extremophiles by Fraser Cain & Dr. Pamela Gay As scientists continue to explore the Earth, they're discovering life, surviving and even thriving in extreme environments. What hints can this give us about what we might find as we search for live on other worlds.
Astronomy Cast 585: Super Earths, Mini-Neptunes & Gas Dwarfs by Fraser Cain & Dr. Pamela Gay Astronomers are finding even more new extrasolar planets and they're starting to discover entirely new categories. There are classes of planets out there that we just don't have any analog here in the solar system. Let's talk about them!
Astronomy Cast Ep. 584: Sample Return Missions From Asteroids by Fraser Cain & Dr. Pamela Gay So with a sample of asteroid Bennu firmly inside OSIRIS-REx's return capsule, it's time to bring this treasure home. So scientists can study the composition and history of the space rock. But it's not the only sample return mission out there, with Japan's Hyabusa II mission also bringing asteroid debris home. So today, let's talk about the missions and what we've learned so far.
Astronomy Cast Ep. 583: The 2020 Nobel Prize in Physics by Fraser Cain & Dr. Pamela Gay This year's Nobel Prize in Physics was awarded to three brilliant researchers who worked out some of the secrets of black holes. Today we're going to talk about the chain of discoveries that led to this award.
Astronomy Cast Ep. 582: Building Bigger Black Holes by Fraser Cain & Dr. Pamela Gay Did you hear the news? Nobel prizes for Black Holes! Now, we know there are stellar mass black holes and supermassive black holes, but how do you get from one to the other? How do black holes get more massive?
Astronomy Cast Ep. 581: Other Kinds Of Novae by Fraser Cain & Dr. Pamela Gay Don't ever accuse us of not comprehensively covering every kind of exploding star. This week we gather up all the left over ways that stars partially or fully explode or don't. Probably. Enjoy!
Astronomy Cast Ep. 580: Exploding Dwarfs By Fraser Cain & Dr. Pamela Gay So you think that a white dwarf star is the end of a stellar life, and it's all downhill from there, a long, slow cool down towards the end of everything. But in some situations even dead stars can get exciting again, briefly becoming some of the brightest objects in the Universe. And maybe, just maybe, the last exciting thing that'll ever happen in the Universe.
Astronomy Cast 579: White and Black Dwarf Stars by Fraser Cain & Dr. Pamela Gay I've got some bad news for you. Stars die. At some point in the next few billion years or so our Sun is going to start heating up, using up all the fuel in its core, and then eventually die, becoming a white dwarf. It'll then slowly cool down to the background temperature of the Universe, becoming a black dwarf. Let's learn about this fascinating process.
by Fraser Cain & Dr. Pamela Gay So have you heard the news? Of course you have. Evidence of phosphene on Venus. Which could be a biosignature of life on our evil twin planet. There have been a lot of surprising stories about Venus, so let's get you all caught up!
Astronomy Cast 577: Mars in Opposition by Fraser Cain & Dr. Pamela Gay Every 2 years or so Mars lines up nicely with the Earth. It takes only 2 minutes to communicate with the rovers. You can see the polar ice caps in a small telescope. And it's the best time to send your spacecraft to the Red Planet. Oct 3rd: Moon & Mars conjunction, 1.1° separation. Oct 6th: Mars opposition. Dec 21st: Jupiter/Saturn conjunction, 0.1° separation! Feb 18th "Percy" lands on Mars' Jezero crater.
Astronomy Cast Ep. 576: Summer Stargazing Special by Fraser Cain & Dr. Pamela Gay It's time once again for Astronomy Cast to go on hiatus. You've got a couple months on your own to explore the night sky. But before we say goodbye, we'd like to make a few suggestions.
Astronomy Cast Ep. 575: Observing The Moon by Fraser Cain & Dr. Pamela Gay As amateur astronomers, we curse the Moon every month. Seriously! Why doesn't someone get rid of that thing! This week, something occurred to us. What if we actually pointed our telescopes at the Moon? What would we see? The Lunar "X" that Fraser talked about will be visible this Friday, June 26th! So go out with binoculars or a telescope and enjoy!
Astronomy Cast Ep. 574: Trojan Asteroids by Fraser Cain & Dr. Pamela Gay We imagine the asteroid belt as a place where all the rocks hang out in the solar system. But there are 2 huge bands of asteroids that orbit the Sun with Jupiter called the Trojans. And soon we may actually get a chance to see them up close!
Astronomy Cast Ep. 573: Exoplanet Atmospheres Not only have astronomers discovered thousands of exoplanets, but they're even starting to study the atmospheres of worlds thousands of light years away. What can we learn about these other worlds and maybe even signs of life.
Astronomy Cast Ep. 572: Twists in Planet Formation by Fraser Cain & Dr. Pamela Gay We're all looking to the next generation of exoplanetary research where we get planets directly. But astronomers are already making great strides in directly observing newly forming planets help us understand how our solar system might have formed.
Streamed live on May 22, 2020. So we're familiar with regular binary stars. Two stars orbiting each other. Simple. Of course the Universe has come up with every combination of things orbiting other things, and this week we look at some extreme examples.
Astronomy Cast Ep. 570: Discovering Comets Discovering comets is one of the fields that amateurs can still make a regular contribution to astronomy. But more and more comets are getting found by spacecraft, automated systems and machine learning. This week we'll talk about how comets are discovered and how you can get your name on one!
