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Another thing is that Earth is close to the upper limit of size to be practical to build rockets to get off of. Of course, a planet that's hotter and wetter pr
by perl4ever 6y ago
Another thing is that Earth is close to the upper limit of size to be practical to build rockets to get off of.
Of course, a planet that's hotter and wetter presumably has more intense competition and it might be better for us if they can't achieve space travel.
- avmich 6y ago> Another thing is that Earth is close to the upper limit of size to be practical to build rockets to get off of. We have low orbital speed just below 8 km/s. A planet with another km/s extra required to get to orbit is quite likely still able to launch rockets. Then, we launch probes with total speed well above 11 km/s. While that speed is achieved over some time, which incurs gravitational losses, we can still assume that even higher low orbital speed can be achievable by chemical rockets.