Comet NEOWISE has come but not yet gone. If there is no cloud cover for the next night or two, you might be able to catch its wispy presence low in the north-west before it fades from view. Don’t feel bad if you haven’t heard of comet C/2020 F3 (NEOWISE), to give this heavenly traveller its full name. It was only discovered on March 27 this year.