Moons of Jupiter
Jupiter has many moons. Some moons are very big. Some moons are very small. They fly around the planet. These moons are cool to see. Do you like the stars?
Early Reader · Change the reading level on the articleSpace articles — Page 17
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 17 of 24
Moons of Mars
Mars has two small moons. They are not round. They look like bumpy rocks. These moons fly around Mars. They help us learn about space. Do you like looking at the stars?
Early Reader · Change the reading level on the articleMoons of Neptune
Neptune has many moons. Some moons are big. Some moons are small. They fly around the blue planet. Triton is a very big moon. It is very cold there. Do you like the stars?
Early Reader · Change the reading level on the articleMoons of Pluto
Pluto has five moons. One moon is very big. It is named Charon. The other moons are small. They fly around Pluto. They are shaped like rocks. Do you like space?
Early Reader · Change the reading level on the articleMoons of Saturn
Saturn has many moons. Some are big. Some are very small. One moon is like a world with air. It has lakes and rivers. Saturn has the most moons. Can you find them?
Early Reader · Change the reading level on the articleMoons of Uranus
Uranus has many moons. Some are big. Some are very small. They move around the planet. They have names from old stories. They are fun to see! Do you like looking at the stars?
Early Reader · Change the reading level on the articleMount Wilson Observatory
People use big tools to see stars. These tools are on a high mountain. They help us see far away. We can learn about the sun too. It is a fun place to look up. Do you like the stars?
Early Reader · Change the reading level on the articleMultiverse
There might be many worlds. Some people think other worlds exist. They could be like a big quilt. These worlds are far away. We do not know for sure. Do you think there are other worlds?
Early Reader · Change the reading level on the articleMusca
Musca is a group of stars. It looks like a small fly. You can see it in the south. It is high in the night sky. It is the only bug in the sky. Can you find it?
Early Reader · Change the reading level on the articleNadir
The nadir is a point below you. It is the way that points down. It points toward the ground. It is the opposite of up. It helps us know where things are. Can you point down to the floor?
Early Reader · Change the reading level on the articleNancy Roman
Nancy Roman loved the stars. She studied how stars move. She helped NASA plan big space tools. One tool was a huge telescope. She helped us see the sky better. Do you like to look at stars?
Early Reader · Change the reading level on the articleNASA/IPAC Extragalactic Database
A big list helps us see space. It tells us about far stars. It has many pictures too. It helps us learn about the sky. It is very useful. Do you like looking at stars?
Early Reader · Change the reading level on the articleNear-Earth object
Rocks fly in space. Some rocks come near our Earth. They can be big or small. They move around the Sun. We look at the sky to find them. It is cool to watch! Do you like looking at stars?
Early Reader · Change the reading level on the articleNear side of the Moon
The Moon has a side we always see. It looks like it has dark seas. These are actually old lava. We see it in our night sky. It is very pretty. Can you see it tonight?
Early Reader · Change the reading level on the articleNeil deGrasse Tyson
Neil deGrasse Tyson loves the stars. He studies how space works. He tells us about the sky. He writes books and shows on TV. This helps us learn about space. Do you like to look at the stars?
Early Reader · Change the reading level on the articleNeutrino astronomy
Tiny bits fly through space. They go through the Earth. They go through you too! We use big tools to find them. These tools hide deep in the ice. They help us see the stars. Can you find them?
Early Reader · Change the reading level on the articleNew General Catalogue
A man made a big list. He wrote down things in space. He saw stars and bright clouds. This list helps us find them. It is a very long list. Do you like to look at stars?
Early Reader · Change the reading level on the articleNew Horizons
A space probe flies far away. It goes to Pluto. It takes very clear pictures. It helps us see far worlds. We learn so much from it. Do you like space?
Early Reader · Change the reading level on the articleNew moon
The new moon is dark. You cannot see it in the sky. It starts a new month for some people. This helps us keep track of time. It is a special time. Can you find the moon tonight?
Early Reader · Change the reading level on the articleNGC 1275
This is a big group of stars. It is far away in the sky. It has long threads of gas. These threads help make new stars. It is a busy place. Do you like to look at stars?
Early Reader · Change the reading level on the articleNGC 4151
There is a big group of stars. It is far away in space. It has a very heavy center. This center helps the group grow. It looks like a big eye. Do you like to look at stars?
Early Reader · Change the reading level on the articleNGC 5548
A big star group is far away. It has a very bright center. This center is a huge black hole. It pulls in things around it. This makes the center glow. It is a pretty sight. Can you look for it?
Early Reader · Change the reading level on the articleNGC 6302
Look at the Butterfly Nebula. It looks like big wings. A hot star lives in the middle. It is very bright and hot. Space is full of wonder. Can you see the wings?
Early Reader · Change the reading level on the articleNGC 6946
Some stars look like bright fireworks. This is a far away place in space. It has many stars. It makes many bright lights. These lights are very pretty to see. Do you like to look at the stars?
Early Reader · Change the reading level on the articleNGC 7027
A bright cloud sits in space. It is very small. It is shaped like a leaf. It glows with blue light. You can see it in a big telescope. It is a beautiful sight. Do you like looking at the stars?
Early Reader · Change the reading level on the articleNice model
The big planets moved a lot. They did not stay in one spot. They moved to where they are now. This happened a long time ago. It helped make our space look right. Can you imagine moving like that?
Early Reader · Change the reading level on the articleNight sky
The night sky is very pretty. You can see bright stars. You can see the Moon too. It helps us see the dark. It is fun to look up. Do you like the stars?
Early Reader · Change the reading level on the articleNo-hair theorem
A black hole is a dark spot in space. It hides many secrets. We can only see three things about it. We see its size and its spin. We also see its charge. It does not have hair like we do. Can you imagine a black hole?
Early Reader · Change the reading level on the articleNorma (constellation)
Norma is a group of stars. It sits in the night sky. It looks like a tool for building. This group helps us find our way. It is very far away. Can you find it in the sky?
Early Reader · Change the reading level on the articleOberon (moon)
Oberon is a moon. It orbits the planet Uranus. It is made of rock and ice. The moon has many big holes in it. It is dark and red. It is a very old place. Can you find it in the sky?
Early Reader · Change the reading level on the articleOberth effect
Rockets can go very fast. A rocket falls toward a big planet. It turns on its engine while falling. This helps it zoom even faster. It is a smart way to fly. Do you want to zoom through space too?
Early Reader · Change the reading level on the articleObservational cosmology
We look at the big sky. We use tools to see far away. These tools help us see stars. We learn how the sky began. It is a big, grand place. Do you like to look up?
Early Reader · Change the reading level on the articleOccultation
Sometimes things in space hide each other. A moon can pass in front of a star. This makes the star go away for a bit. It is like a game of hide and seek. Can you see the stars at night?
Early Reader · Change the reading level on the articleOctans
Octans is a group of stars. It is in the far south sky. It helps us find the south pole. This group of stars is hard to see. It is very faint. Can you find it in the sky?
Early Reader · Change the reading level on the articleOlympus Mons
There is a huge mountain on Mars. It is a giant volcano. It is much taller than our mountains. It is very, very wide too. It is the biggest one we know. Can you imagine such a big mountain?
Early Reader · Change the reading level on the articleOmega Nebula
A bright cloud sits in space. It is full of new stars. Many stars are born there. This cloud looks like a swan. It is very far away. We can see it in the night sky. Do you like to look at stars?
Early Reader · Change the reading level on the articleOpen cluster
Groups of stars live together. They are born from big clouds. These stars are almost the same age. They stay close to each other. You can see some with your eyes. Can you find them in the sky?
Early Reader · Change the reading level on the articleOphiuchus
Look up at the night sky. You can see a group of stars. It looks like a man holding a snake. This group is called Ophiuchus. It is very big and bright. Can you find it in the sky?
Early Reader · Change the reading level on the articleOpportunity (rover)
A robot went to Mars. It had six wheels. It used the sun for power. It looked for water in the rocks. This helped us learn about space. Do you like robots?
Early Reader · Change the reading level on the articleOrbital eccentricity
Space objects move in paths. Some paths are round like a ball. Other paths look like a long egg. This shape can change. It helps us know where planets go. Do you like looking at the stars?
Early Reader · Change the reading level on the articleOrbital elements
Space things move in paths. These paths are called orbits. We use math to find the path. It shows if the path is a circle. It shows how far away things go. This helps us find them. Can you look at the stars?
Early Reader · Change the reading level on the articleOrbital inclination
Space things move in paths. Some paths tilt to the side. This tilt is called an angle. It shows how a path leans. This helps us find things in space. It is very cool! Do you like looking at the stars?
Early Reader · Change the reading level on the articleOrbital period
Things in space move in circles. They go around big things. A moon goes around a planet. The Earth goes around the Sun. This takes a long time. Can you count the days?
Early Reader · Change the reading level on the articleOrbital resonance
Space rocks can pull on each other. This pull happens in a rhythm. It is like pushing a child on a swing. This can keep moons in place. It can also move things away. Do you see the dance in space?
Early Reader · Change the reading level on the articleOrbital station-keeping
Space ships must stay in the right spot. They use small engines to move. This keeps them from drifting away. It helps them stay safe in space. It also helps them do their jobs. Do you like looking at the stars?
Early Reader · Change the reading level on the articleOrbit of the Moon
The Moon goes around our Earth. It moves in a big circle. The Moon stays near us. It helps us see at night. It is a very cool sight. Do you like the Moon?
Early Reader · Change the reading level on the articleOrcus (dwarf planet)
Orcus is a cold world. It is far away in space. It has a lot of ice on it. This ice is very bright. It has one big moon too. Do you like looking at the stars?
Early Reader · Change the reading level on the articleOrigin of the Moon
The Moon is in our sky. Long ago, something hit the Earth. It was a big rock. This hit sent bits into space. The bits joined to make the Moon. Do you like the Moon?
Early Reader · Change the reading level on the article