Galacticraft is a mod that lets you travel to new planets with your own spaceship.

Features:

• Travel throughout the solar system!
• Create and customize your very own spaceship (customization coming soon)!
• Explore new planets and moons!
• SMP Support – Explore with your friends!
• Multiple language support!
• New mobs!
• Lots of new items and blocks!
• Dungeons (coming soon)!
• API to allow modders to add more content, including whole new solar systems and galaxies!

Screenshots:

http://minecraftblogs.com/wp-content/uploads_file/2013/05/Galacticraft-Mod-1.5.2.jar