If you were in spaceship and fired a 100kg probe into frictionless space, how much force would have to be Exeter on the probe to keep it going for 1000 years?

no sign of dia of fuel cell

luster is not a good characteristic to use by itself because luster is the property of minerals that indicates how much the surface of a mineral reflects light. the luster of a mineral is affected by the brilliance of the light used to observe the mineral surface.

3. dark matter

empty space could also be a simple vacuum