Space environment

Space environment or locally related space climate

Cosmic radiation
Hard cosmic radiation is cause by neutrons with energies up to 10^21 eV.

Micrometeoroid and Debris
The orbital environment of a planet usually encounters debris and micrometeoroids traveling at average 7 km/s and up to 20 km/s. The interplanetary environment and interstellar medium usually has micrometeoroids traveling at 70+ km/s on average. The intergalactic medium has micrometeoroids traveling at 1700 km/s. A gas and debris cloud from a supernova can travel at 10% of lightspeed or 30000 km/s.

Solar storm
Solar wind of an average G star can travel up to 2000 km/s.

Nebula
A gas and debris cloud from a supernova can travel at 10% of lightspeed or 30000 km/s.

List of escape velocities
The last two columns will depend precisely where in orbit escape velocity is reached, as the orbits are not exactly circular (particularly Mercury and Pluto).