Gemma: can you remove these numbers on this slide so they’re empty formulae, for teacher to insert: 400, 50%, 2, 10% - the rest leave, they’re ‘constants’ (I couldn’t because tonight Excel kept stopping working when I opened this embedded object). For Linda: we need to preserve the formula cells/labels, but can you ask her to make it look a bit more professional.
Come with me on a walk in the forest around our telescope. There are so many reasons that SETI might exist: ... billions of stars ... Planets going around them ... the Goldilocks zone ... and evolution of intelligence But individually they are not convincing. 4 Engage Elicit Explore Explain Elaborate Extend Evaluate
What are your estimates for each number? 7 100% certain 10% likely 1% quite unlikely 0.1% very unlikely 0.01% extremely unlikely Percentage of planets where intelligent life evolves. 10% a small fraction 25% quite a lot 50% a large fraction 75% almost all Percentage of stars with planets, like our Sun. 150 billion low value 300 billion middle value 500 billion high value No. of stars in the galaxy. 1 only one 2 two are just right 3 three are just right No. of "Goldilocks" planets around each star. Engage Explore Explain Elaborate Extend Evaluate Elicit
Double click to edit (in ‘normal’ mode) or link to spreadsheet Put in your estimates, see what answer you get. This spreadsheet can be used to estimate the number of civilisations in our galaxy that can communicate. 8 Engage Explore Explain Elaborate Extend Evaluate Elicit