I'm back! With a film recommendation

Question

Wow, it's been a long time since I posted a puzzle here... Sorry about that!

I asked a friend the other day what was his favourite film, but he'd reply only in riddles. I don't remember how he described the film as a whole, but about the first half he said:

I look small, but am vast.
A fireball, but in the past.

And about the second half:

In the air you barely see me.
You do me to get rid of me.

And about the middle:

A blue box from elsewhere,
But you, not I, go there.

What was the name of the film?

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Note: you should be able to solve this without knowing anything about the film in question.

Answer 1

The recommended film is

Stardust - a film based on Neil Gaiman's novel, with a famous cast. (Unless OP means a 70's musical with David Essex!)

First half: I look small, but am vast. A fireball, but in the past.

Seen from a distance, stars look tiny, in reality huge. The light we see has taken a long time to arrive.

Second half: In the air you barely see me. You do me to get rid of me.

It's hard to see dust until it settles. Then dust to remove dust.

The middle: A blue box from elsewhere, But you, not I, go there.

The Tardis is the blue police box from Doctor Who. Then switch i to u.

Answer 2

Partial:

First Part:

Sun

Explanation:

look small: in human eyes
but am vast: in reaity
A fireball, but in the past: the sun was like a fireball