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Great question! I know it seems that the whole industry makes round lenses, but you are probably wearing a pair of glasses with non-round lenses. There are many applications where lenses are non-round. Invariably they are more expensive, since most start out round and then are trimmed to a different shape. Various aspects of optical instruments particularly their apertures make round lenses easier to mount and use. This would not stop anyone from making non-round optical devices when they are needed.
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∙ 16y ago
Wiki User
∙ 13y ago- because they were rolled into a ball by an alien
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Why are planets moons ans stars all round?
there gravity pulls them into round balls.
What planets go round the stars?
All 8 planets in our solar system rotate around a star, our sun. Virtually all planets rotate around a star.
Do stars orbit planets or planets orbit stars?
Planets orbit stars.
What is hotter planets or stars?
stars, the planets have to get heat from stars
Which galaxy are the planets on?
Planets orbit stars, stars orbit a galaxy. Planets are not "on" anything. A lot of stars out there have planets - we are just finding out how many now that we have better techniques to find them. So probably all galaxies have at least some stars with planets.
Are all-stars round?
Yes. All the stars are round and all the planets are round.
Are all stars round?
Yes. All the stars are round and all the planets are round.
Why are planets moons ans stars all round?
there gravity pulls them into round balls.
Are all stars and planets are about the same age?
All of the planets are in the same atmosphere. All of the planets are unique. All of the planets are considered planets. All of the planets have moons. All of the planets are named after a mythical person or thing.
Are the sun and planets round?
Yes!!!! The correct term is "spherical", which means round in all dimensions like a ball. (A hoop is round, but is not spherical) Stars and planets are not perfect spheres, but they are very close to perfect spheres.
Why do planets change their position with respect to stars?
Because the Earth and all the planets move in orbits round the Sun, while the stars appear to be fixed if we disregard the Earth's daily rotation.
What planets go round the stars?
All 8 planets in our solar system rotate around a star, our sun. Virtually all planets rotate around a star.
Do stars orbit planets or planets orbit stars?
Planets orbit stars.
What is hotter planets or stars?
stars, the planets have to get heat from stars
Why do planets need their stars?
Planets do not technically need their respective stars, but stars keep planets in orbit and provide heat and light to the planets.
Do planets and moons have stars?
On the contrary! A star has planets, which circulate it. And planets have moons. Stars do not circle planets.
Which pulling force do planets and stars have?
Planets and stars have gravity.
