Klass has been an amateur astronomer for most of her life, having been taught the basics by her father. She was one of a handful of celebrities, engineers and scientists who were at the UK National Space Centre control centre for the touchdown of the UK Mars probe Beagle 2 in the early morning of Christmas Day 2003. Since then, she has been a keen supporter of the UK's work in the European space programme. In March 2006, Klass publicly criticised the proposed closure of the London Planetarium and explained on television how to view Venus in the early morning. She also appeared on Channel 4's "Richard & Judy" to discuss the book "Moondust", which follows the lives of the first men on the moon, and in 2007 attended the televised party on BBC One, held at the home of Patrick Moore in Selsey to mark the 50th anniversary of Moore's monthly programme, "The Sky at Night". Klass once studied astronomy with the Open University.