Refractor Telescope
In a refractor telescope, light is focused using a large lens.
Luna and Ferg take you into the exciting world of stars and planets. They have an important mission for you! Explore secret constellations with them and help discover the coolest planets using the telescope. Along the way, solve tricky puzzles and missions – a real adventure!
Are you ready for your space mission?
Astronomy is the fascinating science of stars, planets, and outer space. It helps us understand how our universe works, why stars shine, and what secrets are hidden within our solar system and distant galaxies.
With a telescope, you can observe stars, planets, and even distant galaxies more closely and discover many details that are invisible to the naked eye.
In a refractor telescope, light is focused using a large lens.
The lens collects the light and creates an image that you can see through the eyepiece. The eyepiece magnifies the image so you can see details. Refractor telescopes are easy to use and ideal for observing the Moon, stars, or planets like Venus. They are perfect for beginners because they are simple to handle and produce clear images.
Why do you need this additional small telescope?
Many telescopes come with an additional small telescope. Why do you need a finder scope? It helps you locate planets more easily, as this is almost impossible with the naked eye. Once you’ve found an object, align the crosshairs to the center. In the finder scope, everything appears upside down and mirrored—but this does not interfere with observation. It offers a wider field of view, making it easier to locate celestial objects before switching to the higher magnification of the main telescope.
In a refractor telescope, light is focused using a large lens.
The lens collects the light and creates an image that you can see through the eyepiece. The eyepiece magnifies the image so you can see details. Refractor telescopes are easy to use and ideal for observing the Moon, stars, or planets like Venus. They are perfect for beginners because they are simple and produce clear images.
Many telescopes have an additional small telescope. Why do you need a finder scope?
It helps you locate planets more easily, as this is almost impossible with the naked eye. Once you’ve found an object, align the crosshairs to the center. In the finder scope, everything appears upside down and mirrored—but this does not interfere with observation.
Use your telescope for the first few times while it’s still bright outside. But be careful: never look at the Sun through a telescope! Once you’re familiar with how it works, nothing will stand in the way of observing the stars.
Never observe through a window or a door. Through glass, it’s almost impossible to focus the image properly. Open the window if you want to see something.
Work your way up slowly to higher magnifications. It’s easiest to start with the lowest magnification.
Pay attention to the weather. Depending on the conditions, observing can become difficult. Your observing location should be as dark as possible.
Tip: Press the “Esc” key to exit fullscreen mode.
For the best view,
please rotate your device.
It’s so big that more than a million Earths could fit inside it.
And inside, it’s as hot as 15 million degrees!
Without the Sun, there would be no life. It provides warmth, light, and helps plants grow.
Do you know what a solar eclipse is? It happens when the Moon moves in front of the Sun, so it suddenly gets dark during the day.
You’ll be able to experience this impressive event twice over the next two years:
on 12 August 2026 and
on 02 August 2027.
The Earth has several layers—like an onion or an egg. On the outside is the Earth’s crust, below that the mantle, then the outer and inner core. The core lies about 6,371 km deep and is very solid because the pressure there is the greatest.
On the very outside is the Earth’s crust. It’s like the shell. This is where we live—where the seas, mountains, cities, and forests are.
Below that is the Earth’s mantle. It is very hot. Sometimes the rock there is solid, sometimes it is liquid—like lava from a volcano.
The outer core lies beneath the mantle, is liquid, and very hot.
The inner core lies in the center of the Earth. It is even hotter, but solid, because the pressure there is enormous. Together, the outer and inner core keep the Earth warm and strong.
The ancient Greeks thought it was spilled milk across the sky.
It has a thick bar of stars in the center, with spiral arms around it that look like the twists of a snail shell.
From Earth, we can see only about 6,000 stars. In reality, the Milky Way contains between 100 and 300 billion stars.
Even though it seems huge, the Milky Way is just one of many galaxies in the universe—some, like the Andromeda Galaxy, are even much larger.
EXOSPHERE
>700 TO 190,000 KM
The exosphere is the outermost layer of air around our Earth. Satellites orbit the Earth in this layer and send us things like weather images or GPS signals. 🛰️THERMOSPHERE
80 TO 700 KM
In the thermosphere, the air is very thin, but the temperature can get extremely hot—over 1,000 degrees! This is where the Northern and Southern Lights glow, and the International Space Station (ISS) orbits the Earth here. 🌡️
MESOSPHERE
50 TO 80 KM
Look up at the sky on a clear night—maybe you’ll spot a shooting star!
STRATOSPHERE
12 TO 50 KM
It starts above the troposphere and reaches up to about 50 km in altitude. The ozone layer is located here and absorbs a large portion of harmful UV radiation. ☀️
TROPOSPHERE
0 TO 12 KM
The lowest layer, where we live and where almost all weather phenomena occur. 🌧️
Push a skewer into each polystyrene ball. This will make painting them easier.
Paint your polystyrene balls in the colors of the Sun, the planets, and the Moon. Afterwards, place the skewers with the balls into a glass to dry.
Measure the diameter of your Saturn ball. Draw two circles on the polystyrene sheet—the inner one the same size as the ball. With an adult, cut out the ring, smooth the edges, and paint it.
Once everything is dry, glue the Saturn ball into the ring. Be careful so it doesn’t break, and let Saturn dry.
Shorten the skewer with the Moon. Use the skewer to poke a small hole in the Earth and fill it with glue. Then press the wooden skewer with the Moon into the hole and let the glue dry.
Cut strings to different lengths: the farther a planet is from the Sun, the longer the string—Neptune will hang the lowest. Ask an adult to help you with the cutting!
Attach the strings to the Sun and planets. Remove the skewers from the balls and tie a knot at the end of each string. Put glue into the hole, push the knot inside, and let everything dry.
Tie the strings to the ring in this order: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune—and secure them with glue if needed.
Start your next
adventure
now!
Luna and Ferg take you into the exciting world of stars and planets. They have an important mission for you!
Explore secret constellations with them and help discover the coolest planets using a telescope.
Along the way, solve tricky puzzles and missions – a real adventure!
Are you ready for your space mission?
Astronomy is the fascinating science of stars, planets, and outer space. It helps us understand how our universe works,
why stars shine, and what secrets are hidden within our solar system and distant galaxies.
With a telescope, you can observe stars, planets, and even distant galaxies more closely and discover many details that are invisible to the naked eye.
In a refractor telescope, light is gathered using a large lens.
The lens collects the light and forms an image that you can observe through the eyepiece. The eyepiece magnifies the image so that you can see details. Refractor telescopes are easy to use and ideal for observing the Moon, stars, or planets like Venus. They are perfect for beginners because they are simple to handle and provide clear images.
Why do you need this additional small telescope?
Many telescopes have an additional small telescope attached. But what is a finder scope used for? It helps you locate planets more easily, because finding them with the naked eye is almost impossible. Once you have found an object, align the crosshair in the center. In the finder scope everything appears upside down and reversed – but this does not matter during observation. It provides a wider field of view, which makes it easier to locate celestial objects before switching to the higher magnification of the main telescope.
Use your telescope for the first few times while it’s still bright outside. But be careful: never look at the Sun through a telescope! Once you’re familiar with how it works, nothing will stand in the way of observing the stars.
Never observe through a window or a door. Through glass, it’s almost impossible to focus the image properly. Open the window if you want to see something.
Work your way up slowly to higher magnifications. It’s easiest to start with the lowest magnification.
Pay attention to the weather. Depending on the conditions, observing can be difficult. Your observing location should be as dark as possible.
Tip: Press the “Esc” key to exit fullscreen mode.
It is so large that more than one million Earths could fit inside it.
Inside, it’s even hotter—around 15 million degrees!
Without the Sun, there would be no life. It provides warmth, light, and helps plants grow.
Do you know what a solar eclipse is? It happens when the Moon moves in front of the Sun, causing it to suddenly become dark during the day.
You can experience this impressive event twice over the next two years:
on 12 August 2026 and
on 02 August 2027.
The Earth has several layers—like an onion or an egg. On the outside is the Earth’s crust, below that the mantle, then the outer and inner core. The core lies about 6,371 km deep and is very solid because the pressure there is the greatest.
The ancient Greeks used to think it was spilled milk across the sky.
It has a thick bar of stars in the center, with spiral arms around it that look like the twists of a snail shell.
From Earth, we can see only about 6,000 stars. In reality, the Milky Way contains between 100 and 300 billion stars.
Even though it seems huge, the Milky Way is just one of many galaxies in the universe—some, like the Andromeda Galaxy, are even much larger.
EXOSPHERE
>700 TO 190,000 KM
The exosphere is the outermost layer of air around our Earth. Satellites orbit the Earth in this layer and send us, for example, weather images or GPS signals.THERMOSPHERE
80 TO 700 KM
In the thermosphere, the air is very thin, but temperatures can become extremely hot—over 1,000 degrees! This is where the Northern and Southern Lights glow, and the International Space Station (ISS) orbits the Earth.
MESOSPHERE
50 TO 80 KM
Look up at the sky on a clear night—maybe you’ll spot a shooting star that lights up brightly and zooms past!
STRATOSPHERE
12 TO 50 KM
It begins above the troposphere and extends up to about 50 km in altitude.
This is where the ozone layer is located, which absorbs a large portion of harmful UV radiation.
TROPOSPHERE
0 TO 12 KM
The lowest layer, where we live and where almost all weather phenomena take place.
Push a skewer into each polystyrene ball. This will make painting them easier.
Paint your polystyrene balls in the colors of the Sun, the planets, and the Moon. Afterwards, place the skewers with the balls into a glass to dry.
Measure the diameter of your Saturn ball. Draw two circles on the polystyrene sheet—the inner one the same size as the ball. With an adult, cut out the ring, smooth the edges, and paint it.
Once everything is dry, glue the Saturn ball into the ring. Be careful so it doesn’t break, and let Saturn dry.
Shorten the skewer with the Moon. Use the skewer to poke a small hole in the Earth and fill it with glue. Then press the wooden skewer with the Moon into the hole and let the glue dry.
Cut strings to different lengths: the farther a planet is from the Sun, the longer the string—Neptune will hang the lowest. Ask an adult to help you with the cutting!
Attach the strings to the Sun and planets. Remove the skewers from the balls and tie a knot at the end of each string. Put glue into the hole, push the knot inside, and let everything dry.
Tie the strings to the ring in this order: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune—and secure them with glue if needed.
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On to the next adventure – are you in?
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