I. What is Hubble Time? Hubble Time is a concept in cosmology that refers to the age of the universe based on the rate of its expansion. Named after the American astronomer Edwin Hubble, who first discovered the expansion of the universe in the 1920s, Hubble Time is a crucial parameter in understanding the evolution … Read more
Scientists track asteroids to assess impact risk, protect Earth, and improve our understanding of the solar system.
Learn how NASA’s DART mission tested asteroid deflection by deliberately crashing a spacecraft into Dimorphos and measuring the orbital change.
Learn how a nuclear device could deflect an asteroid, why stand-off detonations matter, and what mission designs make planetary defense possible.
Learn how solar radiation, sunspots, orbital changes, and atmospheric feedbacks shape Earth’s climate over time.
Learn what planetary defense means, how scientists track space threats, and which tools can reduce asteroid impact risk.
Learn how asteroid deflection missions detect threats, choose techniques, and change an asteroid’s path without destroying it.
Learn what the photosphere is, how it differs from other solar layers, and why it matters for studying the Sun.
Learn how long the Sun will last, what fuels it, and what happens during its final stages over billions of years.
Learn how astronomers detect near-Earth asteroids using sky surveys, orbit calculations, and follow-up observations.