Gerard Kuiper
Gerard Kuiper looked at the stars. He found moons far away. He also found things in the air on Mars. His work helps us learn about space. Do you like to look at the stars?
Early Reader · Change the reading level on the articleSpace articles — Page 12
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 12 of 24
Gherman Titov
Gherman Titov went to space. He flew in a small ship. He was a very young pilot. He saw the Earth from up high. He even took pictures of our world. Can you imagine flying in space?
Early Reader · Change the reading level on the articleGiant-impact hypothesis
A big rock hit the Earth. This happened a long time ago. It made a lot of dust. The dust turned into the Moon. Now we can see it at night. Do you like the Moon?
Early Reader · Change the reading level on the articleGiant Magellan Telescope
A big new telescope is being built. It sits on a high mountain. It has seven large mirrors. It will help us see far stars. It might even find life. Do you want to see the stars?
Early Reader · Change the reading level on the articleGiant Void
Space has a very big empty spot. It is a giant hole in space. There are not many stars there. It is far, far away. It helps us learn about our world. Can you imagine a space that big?
Early Reader · Change the reading level on the articleGiovanni Domenico Cassini
Cassini was a man who loved the stars. He looked at the sky with big tools. He found moons around Saturn. He also made a map of the Moon. His work helps us learn about space. Do you like to look at the stars?
Early Reader · Change the reading level on the articleGliese 581d
Some people think a new world is out there. It might have big oceans. It could have water too. This world is far away in space. We are still looking for it. Do you like to look at the stars?
Early Reader · Change the reading level on the articleGlobular cluster
A star cluster is a big group of stars. They stay close in a round shape. Many stars live in these groups. They are very old. They look like fuzzy balls in the sky. Can you find them?
Early Reader · Change the reading level on the articleGonggong (dwarf planet)
Gonggong is a far world. It is very far from the Sun. This world is bright red. It has ice on it too. It is a big, cold place. Do you like space?
Early Reader · Change the reading level on the articleGordon Cooper
Gordon Cooper was a pilot. He flew high in the sky. He was also an astronaut. He went into space in a small ship. He even slept in space! He was very brave. Did you know he liked to race fast boats too?
Early Reader · Change the reading level on the articleGrand design spiral galaxy
Some space shapes look like big swirls. These swirls have long, bright arms. New stars live in these arms. They look very pretty in the dark sky. It is fun to look up. Can you see the stars?
Early Reader · Change the reading level on the articleGrand unification epoch
Long ago, the world was very hot. Everything was stuck together in one way. Then, the heat began to change. This helped make the things we see. It is a big mystery to us. Can you imagine a very hot start?
Early Reader · Change the reading level on the articleGraveyard orbit
Some old tools go to a far place. They stay far from new tools. This keeps the new tools safe. It stops them from hitting each other. We keep space clean for everyone. Do you like looking at the stars?
Early Reader · Change the reading level on the articleGravitational collapse
Gravity pulls things in. It can pull gas into a star. This makes the star very hot. Some stars get very small. They can even become a black hole. Do you like looking at the stars?
Early Reader · Change the reading level on the articleGravitational lens
Space can act like a lens. Big things bend light. This makes stars look different. It can even make rings of light. This helps us see far away. It is so cool! Do you like looking at stars?
Early Reader · Change the reading level on the articleGravitational-wave astronomy
Big things in space make ripples. These ripples move through space. They look like waves in water. They help us see the stars. We can use them to learn. Can you feel the ripples?
Early Reader · Change the reading level on the articleGravitational-wave observatory
Special tools find tiny waves in space. These waves come from far away. They move space just a little bit. We use light to see them. This helps us learn about the stars. Can you look at the sky?
Early Reader · Change the reading level on the articleGreat Filter
Space looks very empty. We do not see any aliens. Maybe a big wall stops life. This wall makes life very rare. It could be in our past. It could be in our future. Do you think we are alone?
Early Reader · Change the reading level on the articleGreat Red Spot
Jupiter has a huge red storm. It is very big. It is even bigger than Earth! The storm is a pretty red color. It has been around for a long time. Can you see it?
Early Reader · Change the reading level on the articleGreen Bank Telescope
This is a giant dish. It looks at space. It listens for sounds from stars. It helps us learn about the sky. It is very big and tall. Can you see the big dish?
Early Reader · Change the reading level on the articleGrus (constellation)
Grus is a group of stars. It looks like a bird. This bird is a crane. You can see it in the night sky. It is far away in the south. Can you find the bird stars?
Early Reader · Change the reading level on the articleGuion Bluford
Guion Bluford went to space. He was the first Black man in space. He flew in a big ship. This ship went around the Earth. He helped us learn about space. It is a big job. Do you want to fly to space too?
Early Reader · Change the reading level on the articleGuo Shoujing
Guo was a smart man from China. He studied the stars and water. He made tools to tell time. His work helped many people. He helped farms get water. Can you look at the stars tonight?
Early Reader · Change the reading level on the articleGus Grissom
Gus was a brave pilot. He flew a ship into space. He was one of the first. This helped us learn about the stars. He was a very smart man. Do you like to look at the sky?
Early Reader · Change the reading level on the articleGW170817
Two stars crashed in space. This made a big shake. It sent a wave to us. Many tools saw the light. It was a big find! Can you look at the stars?
Early Reader · Change the reading level on the articleHabitable zone
Some places in space are just right. They are not too hot. They are not too cold. This helps water stay liquid. Water helps life grow. We live in a good spot. Do you like the sun?
Early Reader · Change the reading level on the articleHadron era
A long time ago, the world was very hot. It was too hot for us to live. Tiny bits of stuff moved fast. These bits made the world. Now the world is cool. Can you feel the sun's heat?
Early Reader · Change the reading level on the articleHalo orbit
Space tools can fly in a loop. This loop is like a ring. It stays in one spot. It helps us see the sun. It helps us talk to the moon. It is a neat way to fly. Do you like space?
Early Reader · Change the reading level on the articleHarrison Schmitt
Jack Schmitt walked on the Moon. He was a scientist. He looked at Moon rocks. He even took a photo of Earth. He is a very special man. Have you ever looked at the Moon?
Early Reader · Change the reading level on the articleHaumea
Haumea is a small world in space. It is very far away. It spins very, very fast. It even has a ring around it! This world is very bright. Can you find it in the sky?
Early Reader · Change the reading level on the articleHawking radiation
Black holes are very dark. They pull things in. But they can also let out tiny bits of light. This light makes them shrink. Soon, they might go away. Do you think space is big?
Early Reader · Change the reading level on the articleHayashi track
Baby stars go through changes. They start very bright. Then they get dimmer. They stay about the same heat. This helps them grow up. Do you like looking at stars?
Early Reader · Change the reading level on the articleHD 189733 b
There is a deep blue planet far away. It is very hot. It even rains glass there! It is a big world. We can see it with big tools. Do you want to visit space?
Early Reader · Change the reading level on the articleHD 209458 b
There is a big planet far away. It is very hot. It stays near its bright star. This makes a year very short. It has a lot of gas. Can you imagine a world that hot?
Early Reader · Change the reading level on the articleHeat death of the universe
The stars might one day go out. The whole space will get very cold. All the heat will spread out. There will be no more energy. This means nothing can move. It is a big, quiet idea. Do you think space is big?
Early Reader · Change the reading level on the articleHeinrich Wilhelm Matthias Olbers
A man named Olbers looked at stars. He found rocks in space. He also found a comet. He studied the night sky. He helped us know more about space. Do you like to look at stars?
Early Reader · Change the reading level on the articleHeliocentrism
The Sun is at the center. The Earth moves around it. The planets move around the Sun, too. This helps us know where we are. It is a big discovery. Do you like looking at the stars?
Early Reader · Change the reading level on the articleHeliosphere
The Sun makes a big bubble. This bubble is in space. It keeps us safe from bad rays. It is like a shield for us. Can you see the Sun's bubble?
Early Reader · Change the reading level on the articleHelium flash
A star can have a big flash. This happens deep inside the star. It makes a lot of heat. The star gets very bright. It is a big, fast event. Do you like to look at the stars?
Early Reader · Change the reading level on the articleHenrietta Swan Leavitt
Henrietta was a star worker. She looked at stars. She found a way to measure space. This helps us know how big the sky is. It is a big job! Can you look at the stars tonight?
Early Reader · Change the reading level on the articleHenry Draper Catalogue
People made a big list of stars. It helps us find them in the sky. This list has many stars in it. It helps us know the stars better. We can look at the stars too. Do you like to look at stars?
Early Reader · Change the reading level on the articleHenry Norris Russell
Henry was a man who loved stars. He studied the bright lights in the sky. He helped us learn about space. His work helps us see the world. Do you like to look at stars?
Early Reader · Change the reading level on the articleHerbig Ae/Be star
Some stars are very young. They are still growing. They live in clouds of dust. These stars help us learn. It is a big wonder. Can you see the stars?
Early Reader · Change the reading level on the articleHerbig–Haro object
New stars make bright lights. These lights are in space. They come from fast gas. The gas hits big clouds. This makes a glow. It is very pretty! Can you see the glow?
Early Reader · Change the reading level on the articleHercules (constellation)
Hercules is a group of stars. It is very big in the sky. It is named after a hero. This hero is in old stories. You can look for it at night. Can you find it?
Early Reader · Change the reading level on the articleHerschel Space Observatory
A big tool looks at space. It sees very cold things. It finds where stars are born. This helps us learn about our world. It was a great helper. Can you look at the stars?
Early Reader · Change the reading level on the articleHigh-energy astronomy
Some things in space are very bright. They send out big bits of light. We use tools to see them. These lights help us learn. They show us how space works. It is a big world! Can you look at the stars?
Early Reader · Change the reading level on the articleHigh-velocity cloud
Big clouds of gas fly in space. They move very fast. They stay far from our home. These clouds help make new stars. They are part of our big sky. Do you like looking at stars?
Early Reader · Change the reading level on the article