they don't have to but i think its just to make the outer world in order plus the planets all are orbiting the sun. caution this answer is not a correct one its a dummy. believe it or not don't trust all of what i had written down beware
Constellations appear to form images in the night sky, but each of the stars are extremely far away fron each other. They just line up from our own viewing points.
what planet can be seen from earth
All of the planets in our solar system rarely align perfectly due to their different orbital paths and speeds. When a multi-planet alignment does occur, it is not generally a true line-up in space but rather an alignment as seen from Earth. Such alignments can happen every few decades, but a perfect alignment where all planets are in a straight line is extremely rare and has not occurred for hundreds of years.
Spring tide occurs when the Sun, Earth, and Moon are aligned in a straight line, causing the gravitational forces to reinforce each other and leading to higher high tides and lower low tides.
When the sun, a planet, and another body are lined up in a row, it is called inferior conjunction.From the other body, the planet's disc sometimes seems to move across the Sun's disc, and this is called a transit of that planet.
the gears come with a dot punched on each, line them up together,the cam one is down to the crankshaft one and the crankshaft one is up to the cam one so that they are exactly in line with each other almost touching each other
Each outer planet is made up of gas
Is this a quiz? If so I think the answer is line of symmetry?
Homologous chromosomes line up and pair with each other during the stage of cell division called meiosis.
A polygon
Cells make up different organisms. Many of these organisms depend on each other to flourish on our planet such as humans breathing in oxygen given out by trees.
because we are all people on the same planet and should love each other before we blow up the planet with bombs made by hate
The lining up should be done in such a way that the decimal points are underneath each other.
Waves interact with each other as they move. Sometimes their angle is such that they cancel each other out and flatten. Other times they line up in a way that makes them amplify each other.
It will make for a nice "Kodak moment".
I know they can line up,but not orbit the same.The line up is occurring 12/12/12.
Fighting Outstanding Plays Opposite field Touchdowns Beating each other up Amazed fans Loosing team Line up