The diameter of the Sun is about 109 times that of the Earth. Most of its mass consists of hydrogen.
This animation presents the states and state capitals of Germany
Learning about the geographic location, capitals and flags of African countries through...
The Earth is composed of several spherical layers.
The Earth is divided into 24 time zones. Standard time is the time used within time zones.
The Cassini spacecraft was exploring Saturn and its moons for nearly 20 years.
A presentation of the major administrative units of China.
The orbits of the 8 planets in our Solar System are elliptical.
This animation presents some interesting facts in the field of astronomy.