PHOENIX — SpaceX launched 20 Starlink satellites from Vandenberg Space Force Base in California on Sunday night.
Arizonans looked to the west to see the launch at 8:47 p.m.
SpaceX launch, June 23
VERSIÓN EN ESPAÑOL: ¿Vio una luz en el cielo de Arizona anoche?
This was the 11th flight for the first stage booster supporting this mission, which previously launched SDA-0A, SARah-2, and eight Starlink missions.
Soon after the launch, social media took off with photos and videos of the event.
What is Starlink?
Starlink is "the world's first and largest satellite constellation using a low Earth orbit to deliver broadband internet capable of supporting streaming, online gaming, video calls and more," according to the service's website.
The "constellation" of satellites consists of thousands of satellites that orbit Earth at an altitude of about 550 km, or 341 3/4 miles.
The satellites connect to antennas that users set up at their home to provide internet access.
What SpaceX launches look like in Arizona
Launches happen regularly out of California and create a light display over Arizona.
Dr. Vishnu Reddy, a scientist at the University of Arizona in Tucson, studies space situational awareness and basically ... knows a lot about space.
He told 12News the reason the SpaceX rockets light up the sky is not because the engines burn brightly (although they do), it's because of something called the Twilight Phenomenon.
"The sun might have set for us here in Arizona, but it hasn't set in California," Reddy said. "So it's catching that sunlight and reflecting off."
In short, the rocket launches far away, in California. but it goes so high that we can see it in Arizona. And when we see it, it's not in the shadow of nightfall, even though Arizona is. The "glow" is sunlight hitting the exhaust trail, even while we perceive the sky to be black.
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