Space is about to get more crowded for Elon Musk.

The billionaire's Starlink communications network is facing increasingly stiff challenges to its dominance of high-speed satellite internet, including from a Chinese state-backed rival and another service financed by Amazon.com founder Jeff Bezos.

Shanghai-based SpaceSail in November signed an agreement to enter Brazil and announced it was in talks with over 30 countries. Two months later, it began work in Kazakhstan, according to the Kazakh embassy in Beijing.