On May 22, 2026, the Pentagon released classified footage of unexplained flying objects, reigniting discussions about extraterrestrial life. An aerospace scientist explores the feasibility of interstellar travel, noting that any alien visitors would likely come from another star system, such as Proxima Centauri, which is 4.25 light-years away. The journey would take decades, necessitating advanced propulsion methods. Current options include chemical rockets, antimatter propulsion, and nuclear fusion, each with significant drawbacks. For instance, antimatter offers high efficiency but is difficult to produce. Engineering challenges abound, such as designing lightweight structures to withstand cosmic impacts and radiation. Ultimately, while no laws of physics prevent interstellar travel, the combined engineering hurdles and the unknown capabilities of alien civilizations pose significant barriers. If an alien craft were to reach Earth, it would raise profound questions about their origins and technology.