They are so massive that they remain gravitationally bound to together.
Gravity locks the planets into orbits, keeping them from flying off into space and permitting humans to remain on the face of the planet.
The planets that have the most space between them are mercury and Pluto.
Planets are held in orbit around stars by gravity. Their rotation is balanced by the gravitational pull of the star, so they remain in a stable orbit without spinning off into deep space. This gravitational force acts as a sort of "tether" that keeps the planets in place.
Astronomy is the renaissance that studies the planets. They study the planets and space.
A spoon is not soluble in water. It will remain intact when submerged in water and will not dissolve into it.
Friction
There are four mystery cycles that remain intact to this day, and they are: York, Chester, Wakefield, and N town/cycle of Towneley.
NASA gets it's space probes back to earth by computer commands. However. most space probes are not designed for re-entry and remain in space to continuously monitor planets and such.
If they aren't in space, then where else can they be?
Gravity locks the planets into orbits, keeping them from flying off into space and permitting humans to remain on the face of the planet.
The majority of Jamaicans remain intact and keep their foreskins.
of course not!
Astronomy is all about the things in outer space and planets are in outer space.
The planets that have the most space between them are mercury and Pluto.
in space
Planets are held in orbit around stars by gravity. Their rotation is balanced by the gravitational pull of the star, so they remain in a stable orbit without spinning off into deep space. This gravitational force acts as a sort of "tether" that keeps the planets in place.
I assume you mean 2001 a Space Odyssey. No moon bases or giant ring shaped space stations. Pan Am is no longer in business, and they are certainly not providing commercial service to the space station. No manned ships to the gas giant planets. Generally, no picture telephones. The USSR no longer intact.