英文關鍵字
2020
aerospace
agency
america
background
colonisation
conquest
discovery
exploration
flag
flight
journey
landing
mars
martian
mission
national
orbit
organization
planet
program
red
satellite
space
star
stars
technology
travel
universe
usa
英文關鍵字
2020
aerospace
agency
america
background
colonisation
conquest
discovery
exploration
flag
flight
journey
landing
mars
martian
mission
national
orbit
organization
planet
program
red
satellite
space
star
stars
technology
travel
universe
usa