Frequently Asked Questions

Ensemble du système solaire
What is astronomy?

Astronomy is the science of observing objects in the sky: stars, satellites, comets, gas, dust and other non-terrestrial bodies. The aim is to study their origin, evolution, physical and chemical properties.

How to start astronomy?

One of the best ways to get started in astronomy is definitely to talk to other amateur astronomers. If it’s that time of year, you should definitely go to a starry night!
Also look at the astronomical calendar for opportunities to observe the sky with the naked eye and telescope. Some popular magazines will keep you informed of upcoming events. Many Youtube channels dedicated to Astronomy have also appeared in recent years. Take a look at them. You can also read the blog section of our website. A star atlas is also an essential tool, there are many applications that map the sky. If you know of an unused telescope in someone’s attic, ask to borrow it! Binoculars are also a good starting point.
There are many astronomy associations in which anyone can participate and which are very helpful to astronomy enthusiasts. Instruments for observing the sky are increasingly available at more affordable prices.

How to choose a good telescope?

To choose a good telescope, it is necessary to know first of all which telescope corresponds to you. This depends on the level of experience you have (total beginner, amateur, expert) and on what you want to observe.
To have a complete comparison of a panel of telescopes, go to our comparative page of telescopes.

How old do you need to use a telescope?

Children must be at least 6 years old to use a telescope and at least 12 years old to use a refractor.
There are many telescopes for children. It is important that the child knows what he or she wants and chooses the telescope according to his or her abilities. It is important to pay attention to the child’s size and understanding of how the telescope works. It is also advisable to involve the child in all stages of choosing the telescope. To find out which telescope to choose, we recommend that you read our guide to choosing a children’s telescope.

How many stars are there in the Milky Way?

The Milky Way contains about 100 billion stars and spans about 300 000 light years. It is made up of a large number of small galaxies, including our own Milky Way galaxy.

How many galaxies are there in the universe?

There are an estimated 200 billion galaxies in the observable universe. There are several theories to explain the origin of these galaxies. The simplest ones assume that galaxies were born in a huge cosmic cloud: the Big Bang.

How do stars move in space?

The Earth rotates on itself and around the Sun.
The apparent movements of these stars are due to the gravitational attraction between them.