Amazon launched the first test satellites for its planned internet service on Friday as a rival to SpaceX’s broadband network.

United Launch Alliance’s Atlas V rocket blasted off with the pair of test satellites, kicking off a program that aims to improve global internet coverage with an eventual 3,236 satellites around Earth.

Amazon plans to begin offering service by the end of next year.

Elon Musk’s SpaceX has a huge head start over Amazon and its founder Jeff Bezos, who has his own rocket company, Blue Origin.