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Everything that exists.
It is is a moon, planet or machine that orbits a planet or star. Usually, this word refers to a machine that is launched into space and moves around Earth or another body in space.
A set that includes a star and all of the matter that orbits it, including planets, moons, asteroids, comets, and other objects.
The star in the center of our solar system.
An icy rock that lets off gas and dust, which may form tails when it is flying close to a sun.
A place in space where matter and light cannot escape if they fall in.
Rocks floating around in space. Some are the size of a pick-up truck. Others are hundreds of miles across.
A group of stars in the sky. They're often named after an animal, object, or person. The stars form certain patterns based on where you are.
Objects that are round and orbit the sun, just like planets do. But unlike planets, they are not able to clear their path around the sun. That means there are other objects orbiting at roughly the same distance from the sun.
A collection of thousands to billions of stars held together by gravity.
It’s the distance light travels in one year.
Any natural object which orbits a planet.
Our galaxy
Our closest galaxy
The second planet from the Sun.
The smallest and closest planet to the Sun
Our planet
The second-smallest planet in the Solar System
The biggest planet in our solar system
Where you find the most beautiful rings.
The seventh planet from the Sun
The farthest-known Solar planet from the Sun.
It is a natural science that studies celestial objects and phenomena. Its name literally means: the science that studies the laws of the stars.
Dwarf planet in our solar system.
A small, rapidly moving meteor burning up on entering the earth's atmosphere
A celestial object of very small radius (typically 30 km) and very high density, composed predominantly of closely packed neutrons.
A group of stars or galaxies forming a relatively close association.
A small body moving in the solar system that would become a meteor if it entered the Earth's atmosphere.
The curved path that a planet, satellite, or spacecraft moves as it circles around another object.
A giant ball of hot gas that creates and emits its own radiation (light) through nuclear fusion.
The theory that suggests that the universe was formed from a single point in space during a cataclysmic explosion about 13.7 billion years ago.
A star of relatively small size and low luminosity.
A term used to describe matter in the universe that cannot be seen, but can be detected by its gravitational effects on other bodies.
An invisible, hypothetical form of energy with repulsive gravity that permeates all of space and that may explain recent observations that the universe appears to be expanding at an accelerating rate.
The time or date (twice each year) at which the sun reaches its maximum or minimum declination, marked by the longest and shortest days (about 21 June and 22 December)
A cloud of gas and dust in outer space.
A theory of exponential expansion of space in the early universe. The inflationary epoch lasted from 10⁻³⁶ seconds after the conjectured Big Bang.
During this period, the Northern Hemisphere is actually closest to the Sun.
During this period, the Northern Hemisphere is actually farthest from the Sun.
3,26 light years
A celestial body that is in orbit around the Sun, has sufficient mass for its self-gravity, and has cleared the neighbourhood around its orbit.
The time or date (twice each year) at which the sun crosses the celestial equator, when day and night are of approximately equal length (about 22 September and 20 March).
A star that has exhausted the supply of hydrogen in its core and has begun thermonuclear fusion of hydrogen in a shell surrounding the core. They have radii tens to hundreds of times larger than that of the Sun.
A unit of length effectively equal to the average distance between Earth and the Sun.
A theory of the structure of the universe in which Earth is assumed to be at the centre of it all.
The astronomical model in which the Earth and planets revolve around the Sun at the center of the Universe
An atomic reaction that fuels stars.
