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Earth's tilted axis causes the seasons. Throughout the year, different parts of Earth receive the Sun's most direct rays. So, when the North Pole tilts toward the Sun, it's summer in the Northern Hemisphere. And when the South Pole tilts toward the Sun, it's winter in the Northern Hemisphere.
You probably know that a year is 365 days here on Earth. But did you know that on Mercury you’d have a birthday every 88 days? Read this article to find out how long it takes all the planets in our solar system to make a trip around the Sun.
NASA science games, articles and activities for kids.
Earth. What is the atmosphere? How much water is on Earth? Why is the sky blue? How far away is the Moon? Articles, games and activities about our home planet.
The Sun’s activity follows an 11-year cycle. Learn more about it! Why is the sun's atmosphere so much hotter than its surface? Paint pumpkins with space and Earth science designs. This type of weather comes from activity on the Sun’s surface. Articles, games and activities about our closest star.
Earth is a terrestrial planet. It is small and rocky. Earth's atmosphere is the right thickness to keep the planet warm so living things like us can be there. It’s the only planet in our solar system we know of that supports life. It is mostly nitrogen, and it has plenty of oxygen for us to breathe.
The average temperature on Mars is minus 85 degrees Fahrenheit – way below freezing. It is half the size of Earth. Mars is sometimes called the Red Planet. It's red because of rusty iron in the ground. Like Earth, Mars has seasons, polar ice caps, volcanoes, canyons, and weather.
The Short Answer: The Sun is completely blocked in a solar eclipse because the Moon passes between Earth and the Sun. Even though the Moon is much smaller than the Sun, because it is just the right distance away from Earth, the Moon can fully blocks the Sun’s light from Earth’s perspective.
The eight Moon phases: 🌑 New: We cannot see the Moon when it is a new moon. 🌒 Waxing Crescent: In the Northern Hemisphere, we see the waxing crescent phase as a thin crescent of light on the right. 🌓 First Quarter: We see the first quarter phase as a half moon.
As the Moon travels around Earth, different parts of it are lit up by the Sun. These changes in the Moon's appearance from our view on Earth are called moon phases. This graphic shows all eight moon phases we see as the Moon makes a complete orbit of Earth about every four weeks.