Solar System I keep reading about Mars meteorites found on Earth. How do scientists know they came from Mars without samples of martian rocks to compare them?
Science If all photons have the same speed (the speed of light) and the same mass (zero), why does an individual gamma-ray photon have more energy than a radio-wave photon?
The Sun When the Sun produces a coronal mass ejection, is the blast of sufficient force to alter our star’s path through the cosmos? Do these eruptions significantly perturb our solar system?
Science How do scientists know that the particles revealed after a proton or lead ion collision are different from each other, such as quarks and muons, and not just smaller pieces of protons or lead ions? (If I were to smash two lead bullets together, they would break into smaller pieces, but they would still be lead.)
