HS-PS4-4
Evaluate the validity and reliability of claims in published materials of the effects that different frequencies of electromagnetic radiation have when absorbed by matter.
- Physics
A new clock shows how gravity warps time — even over tiny distances
This clock measured how gravity changes the passage of time in different places — even spots just one millimeter apart.
- Physics
Muons reveal the inner worlds of pyramids, volcanoes and more
Tracking these subatomic particles can uncover surprising hidden structures.
- Space
We finally have an image of the black hole at the heart of our galaxy
New observations from the Event Horizon Telescope reveal the chaotic region around the Milky Way’s central black hole, Sagittarius A*, in extreme detail.
- Space
Wild art? No, it’s a radio image of the heart of our Milky Way
Eyelash-like radio filaments accent the brightest feature in this image — a supermassive black hole.
- Animals
Living mysteries: Why teeny-weeny tardigrades are tough as nails
Tardigrades often live in cool, damp moss. Their cushy life has somehow prepared them to survive the lethal radiation of outer space.
- Space
Explainer: Telescopes see light — and sometimes ancient history
Different kinds of telescopes on Earth and in space help us to see all wavelengths of light. Some can even peer billions of years back in time.
- Space
The long-awaited James Webb Space Telescope has a big to-do list
The James Webb Space Telescope has been in the works for so long that new fields of science have emerged for it to study.
- Space
Let’s learn about auroras
A gust of charged particles from the sun called the solar wind lights up auroras on Earth — and on other planets.
- Chemistry
Chemistry solves a French royal mystery
Ink analysis reveals the hidden words of Marie Antoinette's letters and who tried to hide them.
- Space
Explainer: How auroras light up the sky
The northern and southern lights are considered natural wonders of the world. Here’s how these and related splendid sky glows form.
- Physics
Nuclear clocks are nearly here
More precise clocks could improve technologies such as GPS and help scientists test major ideas in science.
- Space
Light from space has record-breaking energy
Hundreds of newly detected gamma rays hint at environments in the cosmos that accelerate particles to energy extremes.
