Science has come a long way from what it used to be. Scientist come up with new technology all the time, BIG TELESCOPES!!
A sun is a star that is the center of a planetary system.
The gears in a planetary gear system are the drive gear, ring gear, and planetary gear.
It would be truly astonishing if the mechanism that produced planets in our solar system had done so in only one instance in the entire universe, so no one was really surprised when they were actually found (though what was found ... "Hot Jupiters" ... was a bit of a surprise).
A galaxy is the biggest among the three. Galaxies contain billions to trillions of stars, as well as other celestial objects like planets and planetary nebulae. A planetary system refers to a star with its orbiting planets, while a planetary nebula is a glowing shell of gas ejected by a dying star.
Our planetary system is called the Solar System, named after the Sun (Latin: Sol) around which all the planets, moons, asteroids, and other celestial bodies orbit.
"Planetary orbits" is the technical term.
A system of celestial bodies grouped around a sun.
planetary science
our solar system exists in barred spiral galaxy
Because it is the planetary system of Sol, another name for the Sun.
ptolemaic
see 'why was Pluto removed from the planetary system? '