Peter Cattermole

饰：Self,(as Dr Peter Cattermole)

Paul Murdin

饰：Self,(as Professor Paul Murdin)

马丁·里斯

Martin Rees

饰：Himself

Heather Couper

饰：Herself

布莱恩·考克斯

Brian Edward Cox

饰：Self - Narrator, (as Professor Brian Cox)

蒂姆·赖斯

Tim Rice

饰：Self,(as Sir Tim Rice)

帕特里克·摩尔

Patrick Moore

饰：Self,(archive footage) (as Sir Patrick Moore)

布赖恩·梅

Brian May

饰：Self,(as Dr Brian May)