Las Vegas lights up with dome billed as world’s largest video screen

The Sphere's fully programmable LED screen houses concert venue built to host tens of thousands of people

The Las Vegas skyline has been dominated by a huge animated dome - billed as the world's largest video screen - dwarfing surrounding high-rise hotels after going live with a 300ft eyeball looking down over the city.

The MSG Sphere's 580,000 sq ft fully programmable LED screen, named the Exosphere, was illuminated for pre-launch testing overnight to celebrate the Fourth of July. The show started with a welcome message, Hello world", followed by fireworks and stars and stripes animations, a moon in a night sky and an imposing Halloween pumpkin. Videos showed the screen overshadowing cars - tiny in comparison - on a nearby road.