For a variety of reasons though to understand physics is a good one. Quantum mechanics along with attempts at merging it with the workings of the heavens and testing of its theories have given rise to a number of conveniences. Namely, the modern microchip.
stars, planets, galaxies, darkness
either a earths outer core b the southern lughts c volcanic rocks
If by all the systems you mean altogether, it would be the galaxy. See, each system is like one of our Solar Systems, with lots of planets, right? and a lot of systems makes up what is known, to them, as a "rim" So there's the inner rim, the middle rim, and the outer rim. Beyond the outer rim are the "unknown regions" where there are no hyperspace lines, meaning the unexplored area of their galaxy and the galaxies beyond.
scientists who found them
The "everything" is called the Universe.
Instruments used in studying outer space include telescopes (both ground-based and space-based), spectrographs, radio telescopes, space probes, and satellites. These instruments help scientists observe and analyze various phenomena in space, such as stars, planets, galaxies, and cosmic rays.
Yes, gravity exists in outer space. Gravity holds the moon in its orbit around the earth. It holds the earth in orbit around the sun. It holds the milky way galaxy together. It holds the local group of galaxies together. And the local group of galaxies might be a group of a string of galaxies held together by the great attractor.
By classified do you mean genre then it is outer space,planets,stars,suns,moons etc. :}
They used a telescope
It is in gray because it is located in another sector. You must travel to that sector to retrieve it.
By using robot space probes and telescopes
Jupiter