Â鶹´«Ã½

Letter: For the record

Published 8 November 2017

• Not so fast: a suggested prototype of a plasma oxygen generator for Mars would use 150 to 200 watts for four hours a day to produce 80 to 160 grams (28 October, p 10).

Issue no. 3151 published 11 November 2017

Â鶹´«Ã½ issue 3151 cover

Sign up to our weekly newsletter

Receive a weekly dose of discovery in your inbox. We'll also keep you up to date with Â鶹´«Ã½ events and special offers.

Sign up
Piano Exit Overlay Banner Mobile Piano Exit Overlay Banner Desktop