ScienceWeek on 2012:

As part of the Science Week lecture series, astronomer Jocelyn Bell Burnell examines the threats from space and explains how much truth there is in the suggestions that killer asteroids, lethal solar flares or the black hole at the centre of the Milky Way (for example) could cause the end of the Earth. Professor Bell Burnell is an Irish science legend - she discovered pulsars while studying for a PhD in radio astronomy.

Info about her:

Susan Jocelyn Bell Burnell, DBE, FRS, FRAS (born 15 July 1943), known as Jocelyn Bell Burnell, is a British[1][2] astrophysicist. As a postgraduate student, she discovered the first radio pulsars with her thesis supervisor Antony Hewish, for which Hewish shared the Nobel Prize in Physics. She was president of the Institute of Physics from October 2008 until October 2010, and was interim president following the death of her successor, Marshall Stoneham, in early 2011. She was succeeded in October 2011 by Sir Peter Knight.