Star Death, STEREO & South Africa’s SKA bid
What happens when a black hole rips a star to shreds? What can a solar science mission tell us about other stars? And is South Africa prepared for the largest radio telescope ever planned? This month on Naked Astronomy, we explore a unique gamma ray burst, discover the useful extra info in data from STEREO, and discuss the South African bid for the Square Kilometre Array. Plus, news of CoGeNT’s search for Dark Matter, Enceladus’ salty sub-surface sea, and clues on the creation of the solar system gathered from the remains of the Genesis mission.
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01:13 - Voyager at the Edge of the Solar System
Data from Voyager 2 shows particles from the solar wind slowing to a halt, perhaps signalling the start of the transition out of the Solar System and into the interstellar medium.
04:38 - Enceladus' Salty Sub Surface Sea
The moon Enceladus sprays out material that makes up Saturn's E-ring. Now, an analysis of particles in the spray suggest they must come from a liquid, salty water below the surface.
07:09 - CoGeNT catches Dark Matter
Results from the CoGeNT experiment back up previous results suggesting dark matter detections...
10:35 - Dark Matter and Cluster Collisions
Gravitational Lensing, X-ray and visual imaging come together to show the distribution of mass in colliding galaxy clusters - with some unexpected results...
13:41 - Genesis and the surface of the Sun
Despite crash landing and contaminating the collection plates, painstaking analysys of solar wind material collected by the Genesis mission shows some isotopic anomalies...
18:15 - Tearing a Star Apart
An unusually bright and long lived burst of gamma rays was detected by the Swift satellite in March this year. It was pretty spectacular and unlike anything ever seen before, and researchers think it was the result of a star about the size of our sun being torn to shreds by a s...
26:23 - How do we know the ultimate fate of Earth?
Hello Dr Chris!
I am thoroughly enjoying listening to the last several years' podcasts during my Ferry Commute and every other reasonable solitary moment I have in the car, during a run or on a walk.
Here's my question... I've heard the story that in 2 billion years, the oc...
28:51 - Why do point light sources behave differently from diffuse ones?
I've just discovered The Naked Scientist and Dr Karl shows. Superb stuff.
I have a question...
In photography, by adjusting the f-stop you can alter the exposure for a given shutter-speed. So for example, a 500mm f2 lens shot at f2 will give the same exposure as a 1...
Fact Impact: A high-speed run-down of facts about Galaxies
34:50 - Seeing Stars in STEREO
The STEREO mission has already given us some amazing 3d images of the Sun as well as advancing our understanding of coronal mass ejections – the cause of space weather. But it’s also proved useful for researchers studying other stars, as I found out from Danielle Bewsher from t...
40:17 - What other evidence do we have of the expanding universe?
Thanks for the podcasts, they're really really great!
I've got an astronomy question which has been bugging me for a while. I'm sure I am missing details and am wrong. I was hoping you could explain and make me less wrong. :-)
As far as I know, the current best theory is...
43:03 - How do we see light from the distant past?
We are just now seeing light from galaxies that formed a few hundred million years after the big bang. I would think that a now-distant galaxy we are observing was relatively close to us at the time it formed. Why are we only now seeing the light from its formation. Is it beca...
The Square Kilometre Array, or SKA, should help us to answer some of the big outstanding questions about our universe. It will either be located in Australia or South Africa. Bernie Fanaroff, project manager for the South African SKA bid, met up with Chris Smith…
52:36 - Could antimatter account for dark matter and dark energy?
My name is Roy .
I am a plumber from Belgium .
And I have a burning question.
As I understand matter and antimatter should be formed in equal amounts when the universe was formed.
The antimatter isn't seen but the matter is.
Could it be that the a...
55:52 - Why didn't the big bang produce heavy elements?
Hi Naked Scientists,
I downloaded every podcast you guys have put out and have been listening to 2 episodes each day every day at work for months! I'm currently through September of 2009, so I might not hear the answer to this question for quite some time, but this is what I...