页码
26 ESO/M.Kornmesser/CC BY 4.0
30 shrimpo1967/Wikimedia Commons/CC BY-SA 2.0
40 Dave Pape/Wikimedia Commons
50 NASA
65 DrStarbuck/Wikimedia Commons/CC BY 2.0
96 Zhihua Yang et al.，“Radiation-Induced Brain Injury after Radiotherapy for Brain Tumor，” IntechOpen，March 25，2015，doi：10.5772/59045，figure 1C/CC BY 3.0/©the Authors
121 SpaceⅩ/Wikimedia Commons/CC0 1.0
127 NASA/Don Davis
136 NASA/Bill Ingalls
146 Virgin Galactic/Mark Greenberg/Wikimedia Commons//CC BY-SA 3.0
148 SpaceportAmerica
154 NASA/Pat Rawling
191 ©ESA/Foster+Partners
200 NASA/Bill Anders
209 The Prototype Lunar Greenhouse（LGH）/Controlled Environment Agriculture Center，University of Arizona
221 JAXA
236 NASA/JPL-Caltech
273 NASA/Clouds AO/SEArch
313 NASA/JPL-Caltech/MSSS/TAMU
328 NASA/JPL-Caltech
333 NASA/SACD
347 NASA/JPL-Caltech/ASI/Cornell