Some are, but the furthest from the sun, Pluto, is also the smallest.
The four innermost planets are considerably smaller than the four outermost, but the correlation of distance and size is not perfect. Earth is the largest of the first four planets, Mercury, Venus, Earth and Mars, even though Earth is number three. Jupiter is the largest of all, even though it is the first of the remaining four; Jupiter, Saturn, Uranus and Neptune.
Pluto isn't a planet anymore, so you could say that
No. Planets look smaller than the sun because they actually are smaller.
Outer planets are gas planets and they are outside the astroid belt and are further away from the sun.
Caca
They are farther away and have larger orbital periods.
Planets further from the sun have larger orbits, which means they have to travel a greater distance in their orbit. Since they are farther away, the gravitational force from the sun is weaker, causing them to move slower in their orbit. This combination of a greater distance to travel and slower speed results in longer orbital periods for these planets.
There are many planets further away from Pluto but they do not orbit the sun so they are not part of our solar system. There are also many stars that are further away from Pluto.
Stars are much further away from earth than the planets. The nearest star other than the sun is over four light years away.
The outer planets are larger.
Because we can see the nearest planets through telescopes and for those much further away we can detect them by their effect on other planets and stars.
Jupiter, and planets further away from the Sun than Jupiter.
It depends on what you mean by "close"
The planets appear smaller than the sun because they are much smaller in size compared to the sun. Even though they may be further away, it is primarily their smaller size that makes them look smaller in the sky.