RT @AAOastro: Never get tired of this video on how we aluminise the big mirror. Happy Friday!
youtu.be/fztRqJerfOk http://t.co/rGMLgki2Uy
RT @AAOastro: Never get tired of this video on how we aluminise the big mirror. Happy Friday!
youtu.be/fztRqJerfOk http://t.co/rGMLgki2Uy