Comet Hyakutake
A bright comet flew by Earth. It was very big in the sky. It had a long tail. It looked blue and green. Many people saw it at night. Have you seen a comet before?
Early Reader · Change the reading level on the articleSpace articles — Page 9
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 9 of 24
Comet Shoemaker–Levy 9
A big space rock hit a planet. It was a comet. It broke into many small pieces. Then it hit Jupiter. It made big dark spots on the planet. Did you see the big spots?
Early Reader · Change the reading level on the articleCommon envelope
Two stars can live close together. Sometimes, one star grows very big. It can wrap around the other star. This makes a big cloud of gas. The stars move closer and closer. They might even become one star. Do you like…
Early Reader · Change the reading level on the articleComoving and proper distances
Space is getting bigger. It grows all the time. Some ways to measure space stay the same. Other ways show space getting larger. This helps us see the stars. Do you like looking at the stars?
Early Reader · Change the reading level on the articleCompact object
Some stars are very small. They are very heavy too. They are left after a star dies. They can be dark or bright. We can see them in space. Do you like stars?
Early Reader · Change the reading level on the articleComputational astrophysics
People use big computers to study space. These machines show us how stars move. They help us see how black holes work. This helps us learn about our world. It is very cool! Do you like stars?
Early Reader · Change the reading level on the articleConvection zone
The sun has hot parts that move. Hot gas moves up in a circle. Then the cool gas sinks down. This helps the sun move heat. It is like a big, warm dance. Can you see the sun's light?
Early Reader · Change the reading level on the articleCo-orbital configuration
Space rocks can dance together. They move in the same path. Some stay near a big planet. Others swap places like a game. It is a fun space dance! Do you like to dance too?
Early Reader · Change the reading level on the articleCoronal mass ejection
The sun sends out big clouds. These clouds fly into space. They can reach our Earth. They make pretty lights in the sky. Do you like the lights?
Early Reader · Change the reading level on the articleCorvus (constellation)
Look at the stars at night. You can see a bird. It is a black crow. The stars make its shape. It sits on a big snake. It is a pretty sight. Can you find the bird?
Early Reader · Change the reading level on the articleCosmic Background Explorer
A machine flew in space. It looked at the stars. It found clues about the start of everything. This helps us know our home. It is very cool. Do you like space?
Early Reader · Change the reading level on the articleCosmic dust
Tiny dust floats in space. It is very small. Some falls to Earth. It helps make new stars. It can even make planets. It is all around us. Can you find it?
Early Reader · Change the reading level on the articleCosmic neutrino background
Tiny bits of light travel through space. They are very old. They started when the world was new. They move past us all the time. We cannot see them yet. Can you imagine tiny bits flying by?
Early Reader · Change the reading level on the articleCosmochemistry
Some people study space rocks. They look at what they are made of. These rocks come from far away. They help us learn about the stars. This helps us know how we got here. Do you like looking at the stars?
Early Reader · Change the reading level on the articleCosmological horizon
Space is very, very big. Light travels from far away. Some light can reach us. Some light is too far. We can only see so much. It is like a big wall. Can you see the stars?
Early Reader · Change the reading level on the articleCrab Pulsar
A bright star spins in space. It is very fast. It flashes like a light. This light helps us see the sky. It is a wonder to watch. Can you see the bright light?
Early Reader · Change the reading level on the articleCrater (constellation)
Crater is a group of stars. It looks like a cup. The stars make a shape in the sky. It sits near a big snake. It is a pretty sight to see. Do you like to look at stars?
Early Reader · Change the reading level on the articleCW Leonis
A big star is far away. It hides in a thick cloud of dust. The star is very bright. It is also very red. It is blowing off its own skin. This star is a special sight. Can you look for it?
Early Reader · Change the reading level on the articleCyclic model
The universe may move in cycles. It grows big and then gets small. It might do this over and over. This could happen forever. It is like a giant wave. Do you think the stars will always be there?
Early Reader · Change the reading level on the articleCygnus A
There is a bright place in space. It is a very big group of stars. It sends out strong signals. These signals reach us far away. It helps us learn about the sky. Can you look for it at night?
Early Reader · Change the reading level on the articleCygnus Loop
A big star once blew up. Now it is a giant cloud. It looks like a bright loop in the sky. This cloud is very far away. It is a pretty sight to see. Can you find it in the stars?
Early Reader · Change the reading level on the articleDark flow
Groups of stars move in space. They all seem to flow one way. This is a big mystery. It might be from far away. We want to find out why. Do you like space?
Early Reader · Change the reading level on the articleDark galaxy
Some galaxies have no bright stars. They are hard to see. They might be made of gas. These dark places help build big galaxies. We are still looking for them. Can you find them in the sky?
Early Reader · Change the reading level on the articleDark matter halo
Space has a big secret. It is a giant cloud. We cannot see it. It stays around our stars. It helps them move. It is very big. Can you find it?
Early Reader · Change the reading level on the articleDavid Scott
David Scott was a pilot. He flew to space. He even walked on the Moon. It was a very big job. He worked hard to get there. Do you like to look at the stars?
Early Reader · Change the reading level on the articleDaytime
The sun makes the day. It shines on our world. This light helps us see. The sun stays up for a long time in summer. It stays up for a short time in winter. Do you like the sun?
Early Reader · Change the reading level on the articleDebris disk
Some stars have rings of dust. These rings go around the star. Rocks and ice hit each other. This makes the dust. It can help us find new worlds. Do you like looking at the stars?
Early Reader · Change the reading level on the articleDeclination
Stars live in the big sky. We use lines to find them. Some stars are up high. Some stars are down low. This helps us see where they are. Do you like looking at stars?
Early Reader · Change the reading level on the articleDefinition of planet
A planet is a big thing in space. It moves around the sun. It must be round like a ball. It also clears its path of small rocks. This helps us know what a planet is. Do you like to look at the stars?
Early Reader · Change the reading level on the articleDeimos (moon)
Deimos is a moon of Mars. It is a small, gray rock. It stays far away from Mars. It looks like a tiny star in the sky. Do you like to look at the stars?
Early Reader · Change the reading level on the articleDeke Slayton
Deke Slayton was a pilot. He flew planes in the sky. He even worked for NASA. He helped pick teams to go to space. He was a very brave man. Do you like planes?
Early Reader · Change the reading level on the articleDelphinus
Look at the night sky. You can see a small shape. It looks like a dolphin. It is made of bright stars. This shape helps us find it. Can you find the dolphin stars?
Early Reader · Change the reading level on the articleDeneb
Deneb is a bright blue star. It sits in the night sky. It is very big and very bright. You can see it in the summer. It looks like a tail. Can you find it?
Early Reader · Change the reading level on the articleDennis Tito
Dennis Tito went to space. He was a space tourist. He stayed up there for eight days. He flew around the Earth many times. It was a big trip! Would you like to fly to space?
Early Reader · Change the reading level on the articleDensity wave theory
Some galaxies look like big swirls. These swirls are like traffic jams. Stars move in and out of them. This helps make new stars. It is a pretty sight! Do you like looking at the stars?
Early Reader · Change the reading level on the articleDialogue Concerning the Two Chief World Systems
A man wrote a book. He talked about the stars. He said the Earth moves around the Sun. Some people did not like this. It was a big idea. Do you like looking at the stars?
Early Reader · Change the reading level on the articleDidier Queloz
Didier is a man who looks at stars. He found a new world far away. It is a planet in space. This helps us learn about our home. He is very smart. Do you like to look at the stars?
Early Reader · Change the reading level on the articleDione (moon)
Dione is a moon. It goes around Saturn. It is made of ice and rock. This moon has big cliffs. It looks very pretty. Do you like moons?
Early Reader · Change the reading level on the articleDipole repeller
Space has a big empty spot. This spot has very little in it. It looks like it pushes things away. But things are just being pulled to a different place. We can see how galaxies move. It is a big mystery! Do you like…
Early Reader · Change the reading level on the articleDiscovery and exploration of the Solar System
We live in a big space neighborhood. It has the Sun and the Moon. It also has many planets. We use tools to see them better. These tools help us learn. It is a very big place! Do you like looking at the stars?
Early Reader · Change the reading level on the articleDiscovery of cosmic microwave background radiation
We can hear the start of space. Two men found a strange noise. It was in the sky. This noise shows how space began. It helps us know the truth. It is very cool! Can you imagine hearing the stars?
Early Reader · Change the reading level on the articleDobsonian telescope
This is a big telescope. It helps us see the stars. It is easy to move. It is not very expensive to make. You can see far away things. Do you want to look at the sky?
Early Reader · Change the reading level on the articleDorado
Dorado is a group of stars. It is in the southern sky. It looks like a gold fish. It has many bright stars. This group is very pretty. Can you find it in the sky?
Early Reader · Change the reading level on the articleDorothea Klumpke
Dorothea loved the stars. She studied the sky in France. She looked at the rings around Saturn. This work helped us learn about space. She was a very smart leader. Do you like to look at the stars?
Early Reader · Change the reading level on the articleDouble Cluster
Two groups of stars live close together. They look like bright lights in the sky. You can see them with your eyes. They look like a shiny sword. They are very pretty to see. Can you find them in the night sky?
Early Reader · Change the reading level on the articleDraco (constellation)
Look at the stars in the sky. You can see a dragon. It stays in the north sky. It stays there all year. It is very pretty to see. Do you like stars?
Early Reader · Change the reading level on the articleDrake equation
Scientists wonder if life is out there. They use a special way to guess. They think about stars and planets. They also think about life. Does it matter if we find friends in space? It is a big mystery! Do you think…
Early Reader · Change the reading level on the articleDumbbell Nebula
A bright cloud sits in the sky. It looks like a big weight. You can see it with tools. It is far away in space. It is a pretty sight to see. Do you want to look up?
Early Reader · Change the reading level on the article