Deep-space challenge · up to ~20 min each way
The Communication Time Delay
Radio signals travel at the speed of light, but the distances are vast: a message to a crew at Mars can take as much as about twenty minutes each way, so a real-time conversation with Earth is impossible. The delay forces crews to handle emergencies themselves and reshapes how missions far from home are commanded and supported.
Systems, programs & concepts
Knowledge connections
- Associated withDeep Space Network (DSN)
- Associated withEarth Independence & Crew Autonomy
Sources
The primary and reference sources this topic draws on.
- NASANational Aeronautics and Space Administration
Mission data, planetary science, space telescopes, and public-domain imagery.
Most NASA-produced imagery is in the public domain; individual items are checked for usage terms before publication.