One of the first experiments carried out by physicists at Jodrell Bank in 1945 was the detection of echoes from meteors by the reflection of radio waves. Eddie Blackhurst tells us about the Jodrell Bank Meteor Detector which he constructed with Megan Argo in 2007.

Nick talked to Roberta Paladini about her work on the Spitzer Space Telescope and the Planck spacecraft. We also find out about her studies of astronomical objects - such as our own galaxy - that obscure observations of the cosmic microwave background radiation.

Pulsars - pulsating neutron stars - are bizarre astrophysical objects. Since 1967 we've discovered over 2000 of them by searching for the periodic pulses they emit. Jim Cordes tells us that some neutron stars are not so regular and can be quite intermittent. We discuss some of the ideas that might explain these intermittent pulsars as well as future telescopes that will look for intermittent events in the sky.

Nick talked to Dr Andreas Faltenbacher about how the Millenium Simulation is an attempt to model the dark matter component of the universe, and how we can compare the simulation to real observations. We also talk about how baryonic matter (namely galaxies), are added into the Simulation to allow us to make those comparisons between the Simulation of dark matter (which we can't see) and the observations of galaxies (which we can see).

Many people study astronomy but not all of them become astronomers. We talked to Debbie Mitchell about her work for the National Air Traffic Control Service following her PhD studying planetary nebulae.

Nick talked to Dill Faulkes about his motivation for setting up the Faulkes Telescope project. There are two Faulkes telescopes: Faulkes North in Hawaii and Faulkes South in Australia. These are two 2 metre robotic telescopes which can be used by students and teachers to conduct research grade observations of the night sky.

Stuart talks to Tim O'Brien (University of Manchester) about the sounds of space. The sounds we played were: The sound of supernova remnant Cassiopeia A recorded by the Lovell TelescopeWhistler wavesProton WhistlersLeonid meteor echoesJovian ChorusJovian S-BurstJovian S-Burst speeded up by a factor 128ESA Huygens lander radar signalSolar sounds generated from 40 days of Michelson Doppler Imager data and processed by A. Kosovichev.Solar Energetic Particles data from the HELIOS missionX-ray observations of Cygnus X-1 from the Rossi X-ray Timing ExplorerPSR B0329+54 observations from the Lovell TelescopeVela pulsar observationsCrab pulsar observationsPSR B1937+21 observationsPulsars in globular cluster 47 TucDouble pulsar eclipseThe first million years of the UniverseThe Cosmic Microwave Background

Elaine Barrett tells us about her very special Level 9 tour of NASA's Space Centre in Houston.

During the partial solar eclipse of 1st August 2008 we caught up with Philippa Browning to find what eclipses are and how they allow astronomers to investigate the Sun.

During the partial solar eclipse of 1st August 2008, Mark Edmonds tells about the evidence that prehistoric people had an interest in the Sun, the Moon and the stars.

You may have heard that the universe is expanding. Around 10 years ago, using observations of supernovae, we discovered that not only is the universe expanding but the expansion is speeding up. Jochen describes observations of supernovae and weak lensing that provide evidence of dark energy and his research into theoretical models that describe the expanding universe.

Just before the release of Galaxy Zoo 2, Chris Lintott tells Stuart about the mysterious blue blob found in the original Galaxy Zoo. The blue blob - known as Hanny's Voorwerp - was spotted close to the large spiral galaxy IC 2497 and Chris tells us about the observations that have been made in an attempt to work out what it is.

Kevin McKeegan talks to Nick about a mystery surrounding measurements of oxygen in samples of the solar wind returned by the Genesis space probe.

Stuart talked to Emily Baldwin who is the Society for Popular Astronomy's Chief Stargazer.

Nick caught up with the current President of the Royal Astronomical Society - Professor Michael Rowan-Robinson - to find out about NAM, the RAS and how Michael first got interested in astronomy.

Stuart talked to biology teacher Jacquie Milligan and pupils from Glenlola Collegiate School about the astronomy they do and their use of the Faulkes Telescope.

Tom Mason gives us an overview of Ireland's largest planetarium based in Armagh. He tells us about the planetarium, some of the exhibits and the large meteorite they have.

Nick talks to Professor Richard Ellis about "cosmic downsizing", how we can learn about the formation history of stars, and how stars cease forming in galaxies.

Nick chats with Professor Brian Schmidt (Australian National University) about using supernovae to measure the accelerating expansion of the Universe and the mysterious Dark Energy.