On a sub-orbital spaceflight, a space vehicle enters space and then returns to the surface, without having gained sufficient energy or velocity to make a full orbit of the Earth. For orbital spaceflights, spacecraft enter closed orbits around the Earth or around other celestial bodies. Spacecraft used for human spaceflight carry people on board as crew or passengers from start or on orbit (space stations) only, whereas those used for robotic space missions operate either autonomously or telerobotically. Robotic spacecraft used to support scientific research are space probes. Robotic spacecraft that remain in orbit around a planetary body are artificial satellites. To date, only a handful of interstellar probes, such as Pioneer 10 and 11, Voyager 1 and 2, and New Horizons, are on trajectories that leave the Solar System.
Only once since I began a twenty year fascination with Einstein's time/light theory have I heard from anyone connected to NASA who dared to address this fact to a sublimely ignorant public. He was hushed up in the slow lane with indifference and a public that couldn't tell you how the world can make it through the next decade without imploding. With a list of almost infinite problems how can we think of getting people out that far, much less plan for the return of our astronauts after 4000 generations of time. What The Moon represents in You. In essence the Moon represents our emotions, responses, habits and contact needs. It symbolises the inner child that gains experience itself through the contact with others. It is our basic need to be loved and nurtured and the 'feeling' self looks to gain this from others. We usually receive this from our family and home environment and often a pet feeds our emotional self. Uncontrolled and immature emotions all come under the Moon's domain as we never lose our inner child. We often revert back into our Moon when we behave irrationally, or become moody or sulky, usually because our needs are not being met. If we feel unsafe or threatened we have a tendency to fall back on our Moon and it is by sign, house and aspect that describes how we react. Similarly, in Norse mythology, Mani is the male personification of the Moon. Mani wanders across the sky in a horse and carriage, perpetually pursued by the Great Wolf Hati who catches him at Ragnarok--which is the "Twilight of the Gods," and the end of everything, in Norse mythology--that is, until it all begins anew.