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 3 of 24
Space ships can use planets to move. They fly near a big planet. The planet pulls the ship. This helps the ship go fast. It can also slow it down. This saves fuel for the trip. Do you like space?
Early Reader · Change the reading level on the articleA huge pull is in space. It pulls many stars and galaxies. It pulls our own home, too. It is very far away. We cannot see it easily. Can you imagine a giant pull?
Early Reader · Change the reading level on the articleA bright star visits us. It is a big comet. It comes back every 75 years. It looks like a snowball of dust and ice. We can see it in the sky. Will you look for it?
Early Reader · Change the reading level on the articleScientists use a special map of stars. It shows how bright stars are. It also shows how hot they are. This map helps us learn about stars. It helps us know how they live. Do you like looking at the stars?
Early Reader · Change the reading level on the articleBig clouds of gas make new stars. These clouds are very bright. They glow in the dark sky. New stars live in these clouds. They help make our world. Can you see the stars?
Early Reader · Change the reading level on the articleHipparchus was a man who loved stars. He looked at the sky to learn. He made a big list of stars. This helped us know where they are. He was a great thinker. Do you like to look at the stars too?
Early Reader · Change the reading level on the articlePeople look at the stars. They study the sky. This helps them know the time. It helps them plant food. It is a very old science. Do you like to look up at the night sky?
Early Reader · Change the reading level on the articlePeople fly to space in rockets. They go far up. They see the moon and stars. It is a big trip. We can learn a lot. Do you want to go to space?
Early Reader · Change the reading level on the articleA dark cloud looks like a horse. It is far away in the sky. It sits near bright stars. This cloud helps make new stars. It is a pretty sight to see. Can you find the horse in the sky?
Early Reader · Change the reading level on the articleSpace is getting bigger. Galaxies move away from us. Far ones move very fast. This helps us learn about space. It is a big discovery. Can you imagine a growing space?
Early Reader · Change the reading level on the articleHubble is a big tool in space. It looks at the stars. It takes very clear pictures. These pictures help us learn about space. It is a great helper. Do you like looking at the stars?
Early Reader · Change the reading level on the articleA big group of stars lives near us. They all stay together in a bunch. They move through space as one. This group looks like a V in the sky. It helps us find the bull in the stars. Can you look for them at night?
Early Reader · Change the reading level on the articleRocks from space can hit Earth. They move very fast. Some rocks make big holes. These holes are called craters. They can change our world. Have you ever seen a big hole in the ground?
Early Reader · Change the reading level on the articleA big home flies in space. It stays high above Earth. Many countries work together there. People live there to learn new things. It is a very big ship. Can you imagine living in space?
Early Reader · Change the reading level on the articleSpace is not empty. It is full of gas and dust. All the planets move through it. This helps us learn about the sun. It is a big, busy place! Can you imagine flying through it?
Early Reader · Change the reading level on the articleSpace is not empty. It is full of gas and dust. This stuff sits between the stars. It helps new stars grow. It is very far away. Can you imagine space being so full?
Early Reader · Change the reading level on the articleIo is a moon near Jupiter. It has many hot volcanoes. These volcanoes shoot stuff into the air. The moon looks very colorful. It has red and yellow spots. It is a busy place! Do you like bright colors?
Early Reader · Change the reading level on the articleSome space groups have no shape. They look messy and wild. They do not have long arms. They can be very small. They can even bump into others. We can learn a lot from them. Do you like messy things?
Early Reader · Change the reading level on the articleJohannes Kepler loved the stars. He looked at the sky. He studied how planets move. He helped make better tools to see far away. His work helps us learn about space. Do you like to look at the stars?
Early Reader · Change the reading level on the articleThis is a place for rockets. It is in Florida. Big rockets fly from here. They go to the moon. This helps us learn about space. Do you like stars?
Early Reader · Change the reading level on the articlePlanets move in special ways. They do not move in perfect circles. They move in oval shapes. Some planets move fast. Some planets move slow. This helps us know where they are. Do you like looking at the stars?
Early Reader · Change the reading level on the articleA big ring of ice sits far away. It stays past the big blue planet Neptune. It has many small, icy rocks. Pluto lives in this cold place. It helps us learn about space. Do you want to see the stars?
Early Reader · Change the reading level on the articleSpace has special spots. These spots stay still. Big things pull on them. They help us park space tools. It is like a quiet place in space. Do you want to look up?
Early Reader · Change the reading level on the articleA big cloud of stars is far away. It looks like a faint cloud in the night sky. It is near our own stars. It helps us learn about space. It is very pretty to see. Can you look for it?
Early Reader · Change the reading level on the articleSome star groups look like flat disks. They have a big round middle. These groups do not have long arms. They have old stars. They also have some dust. Can you see the disk?
Early Reader · Change the reading level on the articleA light-year is a long way. It is how far light can go. Light travels very fast. It can reach far stars. Space is very big! Can you imagine that?
Early Reader · Change the reading level on the articleWe live in a big group. This group has many star homes. Our home is called the Milky Way. Another big home is near us. They are moving closer to each other. It is a busy place in space! Can you look at the stars?
Early Reader · Change the reading level on the articleSome things fly close to Earth. They move very fast. They go around our world. This helps us talk to people far away. It also helps us see the ground. Do you want to fly in space?
Early Reader · Change the reading level on the articleStars send out much light. This light is their power. It stays the same. It does not change. Some stars are very big. They shine very bright. Can you see the stars?
Early Reader · Change the reading level on the articleThe Moon moves into a shadow. This shadow comes from the Earth. The Moon can look red. It looks like a red ball in the sky. This is safe to see. Do you like the red Moon?
Early Reader · Change the reading level on the articleStars have different brightness. Some stars look very bright. Some stars look dim. This helps us see them. It is like a scale. Can you find a bright star?
Early Reader · Change the reading level on the articleMost stars are in a group. This group is called the main sequence. The Sun is in this group. It stays here for a long time. It makes its own food from air. Do you like to look at stars?
Early Reader · Change the reading level on the articleBig tools look at stars. They sit on a high mountain. The air is very dry there. This helps us see far away. It is a special place. Do you like the stars?
Early Reader · Change the reading level on the articleM87 is a giant group of stars. It is very big. It has many stars inside. A dark spot sits in the middle. This spot is very strong. It helps us learn about space. Can you look at the stars?
Early Reader · Change the reading level on the articleStars are made of many things. Most stars are just gas. Some stars have more heavy stuff. This stuff helps make new stars. It is like recycling. Do you like to look at stars?
Early Reader · Change the reading level on the articleSpace rocks fall to Earth. They come from far away. Some look like stones. Some look like metal. They can be very big. They can make a small hole. Do you want to find one?
Early Reader · Change the reading level on the articleA meteoroid is a small rock in space. It moves around the sun. Some fall toward Earth. They look like bright streaks in the sky. They are very cool to see. Have you ever seen a shooting star?
Early Reader · Change the reading level on the articleYou can see lights in the night sky. These are called meteor showers. Tiny bits of space dust fall toward Earth. They move very fast. They make bright streaks of light. It is fun to watch them. Do you like to look at…
Early Reader · Change the reading level on the articleSmall rocks fly in space. They go around the Sun. Some are very far away. They are not big planets. We find many of them. Can you find one in the sky?
Early Reader · Change the reading level on the articleMir was a home in space. It was made of many parts. People lived there for a long time. They did work to learn about space. It was a big home for science. Do you want to visit space?
Early Reader · Change the reading level on the articleSpace has big clouds of gas. These clouds are very thick. They help make new stars. This is how stars are born. It is like a nursery. Can you see the clouds?
Early Reader · Change the reading level on the articlePeople can visit the Moon. They use big rockets to get there. Some people even walked on the Moon. It is a very big trip. We can see the Moon from our homes. Do you want to go to the Moon?
Early Reader · Change the reading level on the articleNASA looks at the stars. They send things into space. They study our world, too. This helps us learn more. We can see far away things. Do you like space?
Early Reader · Change the reading level on the articleNasir al-Din al-Tusi was a smart man. He studied the stars and math. He wrote many books about science. He even helped build a place to look at space. His work helps us learn today. Do you like to look at the stars?
Early Reader · Change the reading level on the articleA nebula is a big cloud in space. It is made of dust and gas. These clouds help make new stars. They can also come from old stars. Space looks very pretty with them. Do you want to see them?
Early Reader · Change the reading level on the articleSpace has big clouds of dust. These clouds spin and get flat. They clump up to make stars. The clumps also make planets. This is how our home began. It is a big, busy job. Can you imagine space making a planet?
Early Reader · Change the reading level on the articleNeil Armstrong was a brave man. He flew planes in the sky. He was the first person to walk on the Moon. This was a very big thing. We can look at the Moon and wonder. Do you like the Moon?
Early Reader · Change the reading level on the articleA star can turn into a small ball. This ball is very heavy. It is much heavier than our Earth. It is also very, very small. It can spin around very fast. Can you imagine a tiny, heavy star?
Early Reader · Change the reading level on the article