Read about planets, stars, galaxies and the people and tools used to explore space. Choose an article below; its reading controls let you move between the available levels.
1,134 public articles · Page 5 of 24
Stars are big balls of hot gas. Heat moves from the middle to the outside. Some stars use light to move heat. Other stars use moving gas to move heat. This heat makes stars shine. Can you look at the stars tonight?
Early Reader · Change the reading level on the articleSpace has very big groups. These groups hold many star cities. They are the biggest things in space. Our home is in one. It is so huge! Can you imagine something that big?
Early Reader · Change the reading level on the articleSome stars are very big. They are much larger than our Sun. They shine very bright in the sky. They can be red or blue. These stars are amazing to see. Do you like to look at the stars?
Early Reader · Change the reading level on the articleA giant black hole lives in space. It is very, very big. It is at the center of many galaxies. Not even light can get out. It is a big mystery. Can you imagine that?
Early Reader · Change the reading level on the articleSome planets are made of rock. They have a hard ground. Earth is one of them. You can stand on them. They are not made of gas. Do you like rocks?
Early Reader · Change the reading level on the articleThe Moon stays near us. It turns as it moves. This keeps one side facing us. We always see the same part. It is like a slow dance. Do you like to look at the Moon?
Early Reader · Change the reading level on the articleTitan is a big moon. It goes around Saturn. It has thick air. It even has lakes! This moon is like our Earth. Can you see it?
Early Reader · Change the reading level on the articleIt is a big group of stars. It looks like a swirl in space. It is very far away. You can see it in the night sky. It is a pretty sight. Can you find it?
Early Reader · Change the reading level on the articleTriton is a big moon. It goes around Neptune. It moves the wrong way. This moon is very cold. It has a thin layer of air. It is a very special place. Do you like moons?
Early Reader · Change the reading level on the articleTycho Brahe loved the stars. He looked at the night sky. He used tools to see things. He found a new star. This helped us learn about space. Can you look at the stars tonight?
Early Reader · Change the reading level on the articleThe whole world is getting bigger. Everything is moving away from each other. This has happened for a long time. It may keep going forever. It will get very dark and cold. Do you think it will ever stop?
Early Reader · Change the reading level on the articleUlugh Beg was a great king. He loved to look at the stars. He built a big place to study them. He made a long list of stars. This helped us know where they are. Do you like to look at the night sky?
Early Reader · Change the reading level on the articleLook at the night sky. You can see a big bear. It is made of bright stars. Some people call it the Big Dipper. It helps you find the North Star. Can you find it too?
Early Reader · Change the reading level on the articleLook at the night sky. You can see a little bear. It looks like a small spoon. It has seven bright stars. One star is the North Star. It helps us find our way. Can you find it?
Early Reader · Change the reading level on the articleValentina was a brave woman. She went into space. She was the first woman to fly alone. This helps us learn about space. She was very young. Can you imagine flying in a rocket?
Early Reader · Change the reading level on the articleSome stars change their light. They can get bright. Then they get dim. A star might swell and shrink. This makes the light change. Do you like looking at stars?
Early Reader · Change the reading level on the articleVega is a very bright star. It shines in the night sky. It is near our Sun. You can see it at night. It is a beautiful sight. Do you like to look at stars?
Early Reader · Change the reading level on the articleMany star groups live together. They are far away. They stay in a big group. This group helps our home. It is very big. Can you see the stars?
Early Reader · Change the reading level on the articleSpace is full of many star groups. These groups are very big. We live in one small group. It is part of a huge web. It helps us see the stars. Can you look at the night sky?
Early Reader · Change the reading level on the articleSpace has big empty spots. These spots are called voids. They have very few stars. Most stars stay in groups. Voids help us learn about space. Do you like looking at the stars?
Early Reader · Change the reading level on the articleTwo machines fly far in space. They visit big, far planets. They send news back to us. These machines are very far away. They help us learn about space. Do you like to look at stars?
Early Reader · Change the reading level on the articleThe Whirlpool Galaxy is a big group of stars. It looks like a spinning swirl. It has a friend nearby. The two stars dance together. It is very far away. Can you see it in the sky?
Early Reader · Change the reading level on the articleA white dwarf is a small star. It is very heavy. It is small like our Earth. It stays bright from heat. It is a cool star. Do you like stars?
Early Reader · Change the reading level on the articleWilliam was a man who loved stars. He built big tools to see them. He found a new planet. It is called Uranus. He also made music. He was a great star watcher. Do you like to look at the sky?
Early Reader · Change the reading level on the articleSome stars are very hot. They are much hotter than our sun. These stars blow gas into space. They shine with a bright light. They are very special to see. Can you look for stars?
Early Reader · Change the reading level on the articleYuri was a brave pilot. He flew a ship into space. He was the first person to do this. It was a very big job. He went around the Earth. We can look at the stars and think of him. Do you like space?
Early Reader · Change the reading level on the articleThe zodiac is a path in the sky. It looks like a big belt. Many stars sit in this belt. Some signs use animals for names. These signs help us know the time of year. Do you see the stars at night?
Early Reader · Change the reading level on the articleHygiea is a big rock in space. It is shaped like a ball. It stays far from Earth. It moves around the sun. It helps us learn about space. Do you like looking at the stars?
Early Reader · Change the reading level on the articleA space rock came from far away. It is a visitor from the stars. It is long and red. It is moving very fast. It will go back into deep space. It is a special messenger. Can you find it in the sky?
Early Reader · Change the reading level on the articleChiron is a small space rock. It travels far from the sun. It has rings around it. These rings look like circles. It acts like a comet too. It is very cool to see! Do you like space?
Early Reader · Change the reading level on the articleIda is a big rock in space. It flies between two planets. It has a small moon too. This moon stays close to Ida. It is a very bumpy rock. Do you want to visit it?
Early Reader · Change the reading level on the articleA space rock came to visit us. It came from a far place. It is not from our sun. This visitor has a long tail. It is very big. It is a special guest! Can you see it in the sky?
Early Reader · Change the reading level on the articleA big tool looked at the sky. It found many stars and space things. It even found a small galaxy. This helps us learn about space. It is a great way to see. Can you look at the stars?
Early Reader · Change the reading level on the articlePallas is a large rock in space. It stays in a belt of rocks. It is very old. It was found a long time ago. It is a big part of our space home. Do you like looking at the stars?
Early Reader · Change the reading level on the articleJuno is a big rock in space. It is a large asteroid. It moves in a long path around the sun. People first found it a long time ago. It is very bright in the sky. Can you look for it at night?
Early Reader · Change the reading level on the articleEros is a big rock in space. It looks like a long peanut. It flies near our home, Earth. A space ship even landed on it! It is a very cool place to see. Do you like looking at the stars?
Early Reader · Change the reading level on the articleLook up at the night sky. You can see a big group of stars. It is very bright. It has millions of stars inside. It looks like a big ball. Can you find it?
Early Reader · Change the reading level on the articleArrokoth is a small ice rock. It looks like a snowman. It has two parts stuck together. It is very far away. This helps us learn about space. Do you like looking at the stars?
Early Reader · Change the reading level on the articleVesta is a big rock in space. It flies around the Sun. It is very bright in the night sky. You might see it if you look up. It is a very special place. Do you like looking at the stars?
Early Reader · Change the reading level on the articleThere is a far away world. It orbits a bright star. This world is very hot. It is a giant ball of gas. We found it in space. Can you look at the stars?
Early Reader · Change the reading level on the articleThere is a far away world. It is named Janssen. This world is very hot. It stays near its bright star. It moves around very fast. This world is a big place. Can you imagine a hot world?
Early Reader · Change the reading level on the articleA man named al-Sufi looked at stars. He wrote a big book. He drew pictures of the stars. This helped us know the sky. He saw a small cloud in space. Can you see the stars too?
Early Reader · Change the reading level on the articleA man wrote a big book. It is about space. It tells how space began. It helps us learn about the stars. It is a very good book. Do you like stars?
Early Reader · Change the reading level on the articleStars have different brightnesses. Some shine very bright. Others are dim. We can compare them all. We pretend they are the same distance away. This helps us see how much light they make. Do you like looking at stars?
Early Reader · Change the reading level on the articleSpace is getting bigger. It grows faster and faster. Everything is moving away. This helps us see the stars. It is a big surprise! Do you like to look at the sky?
Early Reader · Change the reading level on the articleSpace things grow big. Tiny bits pull together. They make stars and planets. This helps build our home. It is how the world starts. Do you like looking at the stars?
Early Reader · Change the reading level on the articleBig things in space have rings. These rings are made of dust and gas. The gas spins around a star. It gets very hot. This heat makes light. Can you see the bright ring?
Early Reader · Change the reading level on the articleAchernar is a bright star. It is blue in color. This star spins very fast. It is not a round ball. It looks flat like a pancake. It is in the far sky. Can you see it at night?
Early Reader · Change the reading level on the article