At 4.2 light-years (1.3 parsecs, 40 trillion km, or 25 trillion miles) away from Earth, the closest potentially habitable exoplanet is Proxima Centauri b, which was discovered in 2016. This means it would take more than 18,100 years to get there if a vessel could consistently travel as fast as the Juno spacecraft (250,000 kilometers per hour or 150,000 miles per hour). In other words, it is currently not feasible to send humans or even probes to search for biosignatures outside of our solar system. Given this fact, the only way to search for biosignatures outside of our solar system is by observing exoplanets with telescopes.