So far, according to media reports, the business-end of Deep Impact that has
been launched to hit comet Tempel-1 is the size of
- A wine cask (NASA)
- A washing machine (The Guardian, CNNi, News.bbc.co.uk*)
- An oil-drum (BBC Radio 4)
I will keep this list updated with more popular-media-sizing-analogs for space probes (half-a dolphin!).
* In keeping with other white-goods in North America, are US washing-machines bigger than their UK equivalents?