Sailor Uranus has two attacks in the anime.

World Shaking

 This is the first attack Uranus uses. She gathers energy then grabs it in her fist. Uranus then throws it towards her opponent, hitting it with a destructive blast simillar to an earthquake.

Animated gif of this attack - World Shaking 1, World Shaking 2

Uranus' second attack is first used at the end of Sailormoon S, but is more memorable in the SuperS movie. To perform the attack Uranus calls upon her Talisman the 'Space Sword'. She then slices the air to send out a bolt of energy, or slices the opponent directly.

Animated gif of this attack - Space Sword Blaster 1, Space Sword Blaster 2