A group of mysterious white lights have been a hot topic on social media today after sightings last night.
Speculations about the mysterious light show ranged from planes, to UFOs and aliens.
But the train of lights in the night sky amazing stargazers across the UK are actually SpaceX satellites.
The satellites are part of a scheme by tech entrepreneur Elon Musk's SpaceX company, launched with the aim of improving global internet coverage.
More than 300 satellites have been launched so far, with the network eventually set to reach 12,000 in the first tranche, rising to as many as 42,000 in the future.
Once in place, the network - known as a mega constellation - will be able to beam internet coverage down to any location on Earth.
Why can we see Starlink satellites?
According to space experts, the current high rate of sightings is due to the satellites being in low orbit after they first launch.
SpaceX launches Starlink satellites in batches of 60 before they gradually rise to a higher orbit and becoming less visible.
The most recent batch was launched in mid-March, with another batch scheduled to be launched on April 23.
The satellites have been deliberately designed to be light and compact so they can be launched in such large batches.
However, despite interest in the project, some have raised concerns over the impact the new network could have on other activities, such as astronomy.
As a result, SpaceX has started to coat the devices with dark paint in order to reduce their brightness.
Several websites allow people to track the current locations of the satellites, including findstarlink.com, where users can also see when Starlink is likely to be visible to them again.
That website suggests parts of the UK could also see a flyover from a group of the satellites just before 10pm tonight (April 20).
