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The diameter of the Sun is about 109 times that of the Earth. Most of its mass consists of hydrogen.
Sun, structure of the Sun, Solar System, Milky Way, hydrogen, helium, fusion, solar flare, sunspot, photosphere, chromosphere, corona, solar wind, granulation, solar prominence, space probe, astronomy, atomic physics, particle physics, geography, physics
Nuclear fusion will serve as an environmentally friendly and practically unlimited source of energy.
A demonstration of nearby planets, stars and galaxies.
The inner planets of the Solar System are terrestrial planets while the outer planets are gas giants.
The formation of the Sun and the planets started with the contraction of a dust cloud about 4.5 billion years ago.
The orbits of the 8 planets in our Solar System are elliptical.
This animation demonstrates the process of star development for average and massive stars.
Ancient Egyptians worshiped a large number of gods and goddesses.
Matter is made up by quarks and leptons, while interactions are carried by bosons.
The three important laws describing planetary motion were formulated by Johannes Kepler.
The diameter of our galaxy is about 100,000 light years; it contains more than 100 billion stars, one of which is our Sun.
Plants are capable of converting inorganic substances (carbon dioxide and water) into organic sugar.
When the Sun, Earth, and the Moon are arranged in a straight line, the Moon can partially or completely obscure the Sun.
The Earth is composed of several spherical layers.
The Earth’s magnetic North and South poles are located near the geographic North and South poles.
The apparent movement of the Sun is caused by the Earth's rotation around its axis.
The Earth is a rocky planet with a solid crust and oxygen in its atmosphere.
This animation demonstrates how the Earth and the Moon were formed.
This animation demonstrates how solar energy can be utilized.
This animation presents some interesting facts in the field of astronomy.
Solar power stations convert solar energy into electricity.
Waves play an extremely important role in many areas of our lives.
Comets are spectacular celestial bodies orbiting the Sun.
Hydrogen atoms within hydrogen molecules are held together by a covalent bond.
This animation explains how a plasma display television works.
The Hubble Space Telescope orbits outside the distorting influence of Earth´s atmosphere.
Jupiter is the largest planet of the Solar System, it has two and a half times the mass of all the other planets combined.
Possible traces of water and life are sought on Mars.
Mercury is innermost and smallest planet of the Solar System.
Neptune is the outermost planet of the Solar System, the smallest of the giant planets
The largest satellite of Pluto is Charon.
Saturn is the second largest planet in the Solar System, easily recognisable by its rings.
Uranus is the 7th planet from the Sun, a gas giant.
Venus is the 2nd planet from the Sun, the brightest object on the night sky (after the Moon).
Nuclear power plants convert the energy released during nuclear fission into electric power.
The Moon is the Earth's only natural satellite
A ray of light is reflected or refracted at the boundary of two mediums with different refractive indices.