The "shooting star" part, the streak of light through the atmosphere, is a "meteor".
Once it hits the Earth, it is called a "meteorite".
moonbeam
Milky way
Farm If you mean... ends with an "m", not ends with "am".
Militia
There is a minor planet called Mannheim, which starts with M, ends with M, and has eight letters.
beacuse it is becaiuse its called methane and starts with a M and ends with E :)
4 letter thing that ends with m is SPAM.
Peter M. Sherwood
Mushroom
Actually, it starts and ends with "M", but you remove the first "M" and insert an "O" ANYWHERE in the word, not just replace "M" with "O"
Medium Maim Mom Mum M&M
MV M. Star happened in 2010.