Comet ISON heading towards the sun. German amateur astronomer Waldemar Skorupa recorded this image from Kahler Asten, in Germany, on November 16, 2013. Image: Waldemar Skorupa (Kahler Asten, Germany), via spaceweather.com
Dr Dave Hawkes is a virologist, science communicator and Molecular Microbiology Manager at Victorian Cytology Service. He’s on Twitter at @MrHawkes.