Correct, because there is no gravity in space and everything can float, the object never stop unless something stops it.
An object in space won't float off in any direction unless it is pushed. When it is it will go in the direction it is pushed and continue until it is either pushed again or bumps into something.
In space, a bullet will continue to travel indefinitely until it runs into an object or is affected by gravity from a nearby celestial body. Without an atmosphere to slow it down, it will retain its initial velocity until something stops it.
Isaac Newton's first law of motion tells us that an object in motion/at rest stays in motion/at rest until acted upon by an unbalanced (outside) force. This is particularly evident in space. In space, in the absence of gravity, an object will travel in a certain direction at a certain speed forever until it either hits something (extremely unlikely) or passes too close to the gravitational influence of something (just a bit less unlikely.) This "something" would be the outside force.
an object that is moving will keep moving until something stops it
By newton's Third law of Motion, every action has an equal and opposite reaction, the astronaut would be thrown back. The tennis ball would however keep on going in the direction until another force acted upon it(planet's gravity, meteor, etc.) by Newton's Third Law
When sunlight bounces off a mirror and hits a tree, the tree absorbs some of the energy and reflects the rest back into space. The sunlight that is reflected into space will continue its journey until it is absorbed by another object or travels indefinitely through space until it hits something else.
In space, there is no atmosphere to provide resistance, so an object can technically travel infinite distances. However, in terms of human capability, the distance you can jump in space would depend on your initial velocity and how you apply force.
If the mass of an object remains constant, and the amount of space underwater it takes up (it displacement) increases, the buoyant force on the object will increase. The object will rise until it regains equilibrium, when it displaces the same mass of water as its own mass.
"an object in motion, shall remain in motion until acted upon by another force" no other forces in space
It doesn't. if a bullet were shot from earth into space and had enough acceleration to pull away from earth's gravity, it would travel indefinitely until hitting an object.
A Telescope
Light is a particle called a foton that is fired of by a star and then continue's to travel in the direction it was fired in for many ages until it reaches something it collides with. it can be that this particle reaches earth or your eye in witch case you see it