Why can't we see mars when it's so big?

eat more carrots to improve your eye site !!! then you will see it and uranus !!!

it's far away, moron.

You can seeit.  Playing stupid is not funny.

We can, with a clear enough sky. Its a red dot, visible without binoculars.

Mars will still be visible through October, but will become fainter as Mars and Earth travel farther away from each other in their orbits around the Sun. ... During this opposition, Mars and Earth are closest to each other in their orbits. That means Mars is at its brightest, so go out and take a look!

We can see Mars. I look at Mars often, even without a telescope. 

We can't see Jupiter or Saturn either, and they're much bigger than Mars. I believe it was in 2012 when Mars came closer to Earth and it was possible to see it with the naked eye. These events happen once in a while, like solar eclipses.

Mars isn't very big, so its brightness – when it is bright – isn't due to its bigness, as is true of Jupiter. Mars' brightness, or lack of brightness, is all about how close we are to the red planet. It's all about where Earth and Mars are, relative to each other, in their respective orbits around the sun.

NASA are really smart. They use a huge magnifying glass.

Mars is not always so big. 

Every once in a while it gets smaller.