Royal Observatory Astronomers Patricia and Greg take you through what to see in the night sky during the month of April in our family friendly Look Up! podcast.

This month, a look back to the tragic story of Apollo 1 as Patricia explains Northrop Grumman's recent dedication of its Cygnus spacecraft to astronaut Roger Chaffee, while Greg looks at much longer journeys as he talks about hypervelocity stars, objects being ejected from our home galaxy out into the depths of space.

Join us on Twitter @ROGAstronomers and vote for your favourite story!