A spacewalk is one of the most dangerous things humans do in space. Discover the science behind spacewalks and how astronauts survive, move, and work in the vacuum beyond Earth.
The James Webb Space Telescope, known as Webb, is giving scientists new ways to spot atmospheres like Earth’s on distant planets. Webb looks at faint infrared light. That light can carry the fingerprints of gases such as water vapor, carbon dioxide, oxygen, methane and ozone. These are the same gases that help make Earth habitable.
When you look up at the night sky, it’s natural to wonder: What is everything around me actually made of? From the glittering stars to the empty space between galaxies, the cosmos is a blend of familiar stuff—and a whole lot of mystery. In this post, we’ll break down the three main components of the universe, explain why they matter, and use easy examples to illustrate the strangest ingredients.
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