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The Prime Minister Boris Johnson announced an indefinite moratorium this week on mining of shale gas by hydraulic fracturing, aka fracking, in the UK, citing fears of earthquakes and seismic activity caused by fracking in the past. In August this year, a 2.9 magnitude earthquake was recorded at the Preston New Road fracking site in Lancashire, which prompted an immediate shutdown, as required by the strict protocols that we have in place. Adam Rutherford talks to Dr James Verdon, a geophysicist at Bristol University and a co-author of one of the Oil & Gas Authority studies on the Preston New Road, about the science of fracking.

Bloodhound is the latest British attempt at the supersonic land speed record. All this week Wing Commander Andy Green has been burning across a dried out lake in the Kalahari Desert, as he and his team are building up to break the sound barrier at 740mph, and his own land speed record of 763 mph. Â鶹ԼÅÄ science correspondent Jonathan Amos reports from the trackside.

The Big Compost Experiment is a new citizen science project about the wonderful, rich, fruity and essential substance you can produce by doing not that much at all. Architect Danielle Purkiss and Mark Miodownik, material scientist at UCL tell Adam why they are launching this experiment.

The planet Mercury, messenger of the Gods, passes between us and the Sun on average just thirteen times a century. This astronomical event will be visible in the UK – weather permitting – next Monday, 11th November. Solar physicist Lucie Green explains how to see the transit of Mercury.