Fraser Cain
Universe Today
Dr. Pamela Gay
CosmoQuest
Funding for basic science has always been tricky business, coming mainly from universities, government, companies, or wealthy individuals, but who knows how many fascinating discoveries were never made because of a lack of funding? We now live in an era where regular people can come together to find scientific discoveries.
You’re familiar with the Hubble Space Telescope, of course, but it’s just one of NASA’s Great Observatories. After Hubble came three more incredible observatories, each greater than the last. Together, they would fill in almost the entire electromagnetic spectrum.
After Pluto lost its planethood, we were down to 8 planets. But there’s growing evidence of another world (or worlds) out beyond the orbit of Pluto. Is Planet 9 out there and how will we find it? Could there even be a Planet 10?
There are asteroids and there are comets. But there’s an entirely separate class of objects called centaurs. But instead of half-human, half-horse, imagine an object that’s half comet, half asteroid but 100% interesting.
Recent Episodes
When the Universe formed after the Big Bang, all we had was hydrogen. But through the process of fusion, these hydrogen atoms were crushed into heavier and heavier elements. Fusion gives us warmth and light from the Sun, destruction with fusion bombs, and might be a...
Now we're going to answer a question that a 4-year old might ask - what is temperature? Why are things hot and why are they cold? How hot or cold can they get? And how is this all important for astronomy? Download Ep. 204: Temperature Jump to Shownotes Jump to...
Europa is the smallest of the Jovian satellites, but it might be one of the most exciting spots in the Solar System. When NASA's Voyager spacecraft flew past the moon, they discovered huge cracks in its icy surface. Is it possible that Europa has a huge ocean of...
With the discovery of a planet in the habitability zone of Gliese 581, the chances of finding life on other worlds is just getting better and better. Let's take a look at the discoveries made at Gliese 581, provide some perspective on the real chances of life, and...
Titan is Saturn's largest moon, and the second largest moon in the Solar System. It's unique in the Solar System as the only moon with an atmosphere. In fact, scientists think that Titan's thick atmosphere - rich in hydrocarbons - is similar to the early Earth, and...
The first interplanetary series of missions was the American Mariner program. These successful spacecraft visited Mercury, Venus, and Mars, and laid the groundwork for the US missions to the outer planets. Let's take a look at the program and their incredible...
Launched in 1977, the twin Voyager spacecraft were sent to explore the outer planets: Jupiter, Saturn, Uranus and Neptune. Because of a unique alignment of the planets, Voyager 2 was the first spacecraft to ever make a close approach to Uranus and Neptune. Let's take...
Space missions are expensive to build and launch, so there's a lot of planning that goes into choosing exactly what's going to be shot into space. Space scientists and engineers recently went through the process of deciding on their science goals, so we thought we'd...
In this special live Dragon*Con 2010 episode of Astronomy Cast we welcomed special guest Les Johnson, Deputy Manager for NASA’s Advanced Concepts Office to talk about the state of human space exploration. And then we opened up the show to some amazing questions from...
Astronomers measure the brightness of stars as magnitude. But this brightness depends on the distance to the star as well as the total amount of energy it's pumping out into space. And from our vantage point here on Earth, appearances can be deceiving. Download Ep....
Saturn is best known for its rings. This huge and beautiful ring system is easy to spot in even the smallest backyard telescope, so you can imagine they were a surprise when Galileo first noticed them. But astronomers have gone on to find rings around the other gas...
In 2006, the International Astronomical Union demoted Pluto out of the planet club. But they also started up a whole new dwarf planet club, with Pluto, Eris and the asteroid Ceres as charter members. Let's find out what it takes to be a dwarf planet, and discuss the...
We talk a lot about telescopes here on Astronomy Cast, but you really don't need any special equipment to appreciate what the night sky has to offer. Just head outside with some sky charts, maybe a planisphere, some friends and hot chocolate, and you're good to go....
The Chandra X-Ray Observatory is the third of NASA's Great Observatories, sent into space aboard the space shuttle to view the Universe in high energy X-ray radiation. This is the territory of supernovae, supermassive black holes and neutron stars; some of the most...
The first half of the 20th Century was a productive time for astronomy, with theorists working out much of the science that we take for granted today. One of these astronomy stars was Subrahmanyan Chandrasekhar, who determined the maximum mass of a white dwarf star....
Last week we studied Kepler the man, and this week we take a look at Kepler, the mission. Launched in March, 2009, this is a spacecraft designed to search for Earth-like planets orbiting other stars. Let's take a look at the history this mission, the launch and the...
Nicolaus Copernicus changed our understanding of the Universe when he rearranged the Solar System to put the Sun at the center, with the Earth becoming just another of the planets orbiting it. But the movement of the planets didn't really match the theory; not until...
We spent 5 episodes telling the story of astronomy so far, how we got from the work of the Babylonians to the modern discoveries made in the last decade. But now we want to look forward, studying the current space missions and experiments to uncover the mysteries that...
Many of the modern ideas in astronomy happened in just the 20th century: dark matter, the Big Bang, inflation, quasars, black holes. So many discoveries in one important century. Download Ep. 187: History of Astronomy, Part 5: The 20th Century Jump to Shownotes Jump...
With our proper place in the Universe worked out, and some powerful telescopes to probe the cosmos, astronomers started making some real progress. The next few hundred years was a time of constant refinement, with astronomers discovering new planets, new moons, and...