How do I get past the penguins

Hint 1 of 7:

Read the sign they are carrying.

Hint 2 of 7:

You need to give them money.

Hint 3 of 7:

Seen any coins lately.

Hint 4 of 7:

One's on Venus.

Hint 5 of 7:

In the VisiComm booth. Pull the coin return knob.