What Goes Up

The more of this there is, the less you see. 

What is it?

I am the second planet from the sun.

I spin the opposite direction as Earth.

who am I?

I am small. I have feathers.

I lay eggs. I can sing and fly.

Who I am?

Can you name the four days of the week that begin with letter "T"

It is purple. It is Long.

It is a softer vegetable. It grows from a plant.

What is it?