Elon Musk's SpaceX has cancelled its launch of 60 satellites into space tonight due to poor weather conditions.
The Falcon 9 rocket was due to lift off from the Kennedy Space Center in Floria at 4.59pm (GMT).
But, for the second time, the launch has been called off because of the weather.
SpaceX tweeted: "Standing down from today’s mission due to weather; proceeding through the countdown until T-1 minute for data collection. Will announce a new target launch date once confirmed on the Range."
The weather originally looked "60% favourable", but rain and even lightning swept the area minutes before the rocket was due to take off.
The launch was originally meant to happen on June 26, but was delayed because the SpaceX team "needed additional time for pre-launch checkouts".
Today was supposed to be the company's tenth launch.
Elon Musk is hopeful that when the launch happens, the satellites will provide low-cost internet to remote areas on Earth.
Starlink explained: “With performance that far surpasses that of traditional satellite internet, and a global network unbounded by ground infrastructure limitations, Starlink will deliver high speed broadband internet to locations where access has been unreliable, expensive, or completely unavailable.”
However, several astronomers have raised concerns that one of the satellites could pass in front of a telescope and obscure an image.
In a recent study, published in arXiv, researchers led by Stefano Gallozzi, wrote: "Depending on their altitude and surface reflectivity, their contribution to the sky brightness is not negligible for professional ground based observations.
"With the huge amount of about 50,000 new artificial satellites for telecommunications planned to be launched in Medium and Low Earth Orbit, the mean density of artificial objects will be of >1 satellite for square sky degree; this will inevitably harm professional astronomical images.”
Earlier this year, NASA an SpaceX successfully launched two astronauts into space as part of a historic mission.
Astronauts Robert Behnken and Douglas Hurley were launched into space on board a SpaceX Falcon 9 rocket on May 30.
But that launch was also delayed because of poor weather in Florida, just moments before it was due to take off.
It was the first time humans have been launched from the US since 2011.
While astronauts are regularly launched from Earth to the International Space Station, these launches don’t usually take place in the US.
The SpaceX rocket docked with the International Space Station 24 hours later.
