Although humans can't hop into a time machine and go back in time, we do know that clocks on airplanes and satellites travel at a different speed than those on Earth.

Sep 25, 2025 · Learn about the Moon's phases!Why does this happen? The shape of the Moon isn’t changing throughout the month. However, our view of the Moon does change. The Moon …

Sep 25, 2025 · Time on Neptune One day on Neptune goes by in 16 hours. Neptune has such a long journey around the Sun it takes 165 Earth years to go around once. That’s a long year! …

Sep 25, 2025 · Just how close is the Sun to Earth? Way, way closer than other stars, but still pretty far away. It’s approximately 93 million miles away from Earth. That’s 400 times farther …

Sep 25, 2025 · This seems really fast, but objects in space are so far away that it takes a lot of time for their light to reach us. The farther an object is, the farther in the past we see it.

Sep 25, 2025 · Why does NASA care about years on other planets? NASA needs to know how other planets orbit the Sun because it helps us travel to those planets! For example, if we want …

Sep 25, 2025 · Light year: It’s not a year, or an amount of time at all. It’s the distance light travels in one year. It’s the same as 5,878,499,810,000 miles (or 9,460,538,400,000,000 meters). …

Sep 25, 2025 · Image credit: NASA/University of Texas Center for Space Research GRACE detects tiny changes in gravity over time. These changes have revealed important details …

Sep 25, 2025 · Eek! Airplanes and satellites can experience changes in time! Read on to find out more. It all depends on what the spacecraft will do! Read on to learn more. A transit is when …

Sep 25, 2025 · The Space Place Experiment Center do PDFs of Space Place activities Print-ready, downloadable PDFs of fun hands-on activities. do Write your own zany adventure story! …