No one knows for sure if aliens exist, but there are plenty of sightings in Indy that bolster belief. According to the National UFO Reporting Center, there have been over 2,000 sightings in Indiana — and ~254 sightings in Indy alone.

Eyewitness accounts

They say seeing is believing. Here are several eyewitness accounts of UFO sightings in Indy from the State Report Index:

Oct. 10, 2011 | “It was one craft with white lights going very slow, then stopped, then the craft went back the way it came 3x its original speed.”
Sept. 24, 2012 | “Triangular craft with two blue white strobing lights over Indianapolis.”
May 15, 2013 | “Large, flat sphere with BRIGHT red and white fast, flashing lights flying in Indianapolis, Indiana.”

Want to file a report? Make like Saturn, and give the National UFO Reporting Center a ring.

What causes the sightings?

Airplanes | One possible reason for the sightings in the Circle City could be due to the activity at IND. Even a commercial plane can create vivid vapor trails that may look like extraterrestrial evidence.
Sprites | A natural phenomenon known as sprites occurs in the Indy area. (For instance on Oct. 31, 2008, “strange yellow lights streaked across the Indiana night” in Indy.) Sprites are flashes of light triggered by thunderstorms that may resemble flashing spacecraft lights. They can appear as balls of electricity or streaks of light.
Clouds | A hole-punch cloud (a donut-shaped cloud that can look like a flying saucer) can occur when a plane flies through cirrus or cirrostratus clouds.
Optical illusions | Reflections may look like lights in the sky, especially at night. Sightings on I-70 may be headlights refracting off the windshield or rearview mirrors.

Or… maybe the sightings really are visitations from extraterrestrial tourists. The aliens might have heard that the Indy 500 is around the corner and decided to challenge us to a different kind of race.