A NASA scientist suggests that extraterrestrial civilizations might be just advanced enough to have already tried finding us and given up.
A NASA scientist suggests that extraterrestrial civilizations might be just advanced enough to have already tried finding us and given up.
An object from another star system is adjusting its trajectory toward Mars while emitting perfectly timed gas pulses that shouldn’t exist in nature.
A Harvard astronomer’s controversial theory about a massive object hurtling through our solar system has ignited fierce debate in the scientific community — and raised questions about whether humanity should prepare for contact.