Could the Hubble Telescope see footprints on the moon?

17 May 2009

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Question

Could the Hubble space telescope see the footprints made by the Apollo astronauts on the moon’s surface?

Answer

Dave Ansell took a look at this question...

Dave - Well, Hubble is an incredible telescope but, looking up its resolution, I reckon it has a resolution of 0.05 arcseconds: that means it can distinguish two objects which are 0.000013 degrees apart; any closer together than that and they merge into one object.

Chris - In practical terms, what does that mean?

Dave - That means if something - the distance of the moon away from us... 

Chris - So about a quarter of a million miles to the moon?

Dave - Yes, about 384,000 kilometres - that means you can see something 9 to 10 metres across on the moon, so probably not.

Chris - That would be a very big footprint - Bigfoot literally. Okay, thank you Dave!

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