A probability of zero means an outcome is impossible. A probability of 1 means an outcome is certain. All other probabilities have a value between 0 and 1. Outcomes close outcomeA potential result.

Scientists are working on an accurate way of calculating the probability of finding alien life elsewhere in the universe. Astrophysicists have developed a theoretical model that could be used to ...

NASA and European scientists explain how they calculate the probability of the space rock 2024 YR4 impacting our planet, and why it’s not yet time to worry.

The odds a U.S. recession will someday be determined to have begun between January 2025 and January 2026 have dropped to a ...