Hubble detects helium in the atmosphere of an exoplanet for the first time. Astronomers using the NASA/ESA Hubble Space Telescope have detected helium in the atmosphere of the exoplanet WASP-107b. This is the first time this element has been detected in the atmosphere of a planet outside the Solar System. The discovery demonstrates the ability to use infrared spectra to study exoplanet extended atmospheres. Source 2b.
As we continue to explore more and more of our solar system and the surrounding universe I would not find it surprising to find evidence of Alien made objects within the next few years.