They utilize Sunlight for this.
Because the sun is shining on them and illuminating them.
Exactly like rocks on the table in a dark room when you go in there
with a flashlight.
That was Galileo in the early 1600s.
I think when the telescope was invented, I think people use it to look at other planets. Even moons.
There are 178 known moons that orbit planets in our Solar System. A lot more might be discovered - depending in part on the size limit you want to use.
There is a cool calculator you can use to see any weight as it would be on other planets and moons. click on this link:Your Weight on Other Worlds
Earth is the only planet with one moon. Pluto use to be classified as a planet. It had only one discovered moon for a while, but astronomers have since found more moons belonging to Pluto.
"Weight" is not really a good word to use. A better term is "mass". The outer planets all have moons, and these can be used to get a value for the planet's mass ... the orbital period of a satellite depends on the mass of the primary and the semi-major axis of the orbit. It's possible to get quite good mass values for the outer planets by studying the orbits of their moons.
They analyze the spectrum of a star's light and the black lines in the spectrum indicate different elements in the stars atmosphere. The same process can be used on planets and moons.
you can see mars and Jupiter but they look like stars unless you use a telescope ------------------------ Because stars shine - give off light - while planets do not.
The major sources of light in space are the stars that are actively fusing matter. Planets and moons shine by reflected sunlight. However, Earth (with its many electric lighting systems) does give off some light of its own, as do the volcanoes on some geologically active moons.
you can use banana skin too shine shoes it works really great their skin have a kind of 'thing' that can shine shoes!!
what do you mean use other planets?
To rise and shine