I. What is the Color Index? The Color Index is a numerical value that astronomers use to quantify the color of a celestial object, such as a star or galaxy. It is a measure of the difference in brightness between two different wavelengths of light, typically in two different filters or passbands. By comparing the … Read more
Explore how doctors treat astronauts in space using telemedicine, onboard medical kits, remote diagnosis, and emergency procedures in microgravity.
Explore how NASA spacesuits protect astronauts from vacuum, radiation, temperature extremes, and micrometeoroids during spacewalks and missions.
Learn how microgravity changes blood volume, vessel function, and cardiovascular control in astronauts.
I. What are Comets? Comets are celestial bodies made up of ice, dust, and rocky material that orbit the sun in elongated, elliptical paths. They are often referred to as “dirty snowballs” due to their composition of frozen gases and particles. Comets are believed to be remnants from the early formation of the solar system, … Read more
Learn how spacesuits supply oxygen, remove carbon dioxide, and keep astronauts alive during spacewalks and emergencies.
Learn how microgravity changes astronaut eyes, why SANS happens, and what NASA researchers are doing to protect vision in space.
Spaceflight places unusual pressure on the brain and behavior, making mental health a core mission requirement, not an optional concern.
Isolation in space can alter mood, sleep, cognition, and team performance. Here’s how astronauts adapt and what space agencies monitor.
Astronauts need medical training to handle emergencies, monitor health, and protect crews during long missions far from Earth.