"Houston, we have a problem."

This immortal phrase from the 1970s when Houston was the center of the U.S.' space program has been turned inside out.

The problem today is that UFOs have appeared in the skies over the city. Is Houston ready to experience extraterrestrial visitors?

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Texans snapped multiple photos of alleged UFO sightings over Houston and posted them on Twitter last week. The photos are pretty convincing.

The images on Twitter show a large oval disc that appears to be a UFO among storm clouds. Aside from its odd shape, the UFO seems to be flashing multiple bright white lights arranged around the outer edge of the object, thus creating an illuminating circle in the sky.

Dr. Carolyn Summers, vice president for Astronomy at Houston Museum of Natural Science, said in a TV interview that the trick with UFOs is figuring out what else they could be. She said it's really easy to tell could be aliens while thinking scientifically.

There haven't been any solid explanations about what UFOs really are. Dr. Summers said the stormy weather could be part of explanation.

If the UFO sightings are real, Dr. Summers said the best way to interpret its origin is to obtain multiple witnesses and take photos from different angles.

This is the best way for experts and scientists to figure out what it is and where it is and to offer an explanation.

The question is whether Texans captured a UFO flying over the city or if it's one of the innumerable hoaxes running on the web.

TagsUFO, Houston, UFO sightings, extraterrestrial, aliens