Category: Science
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Uranus (planet)
Uranus is the seventh planet in the Solar System in order of distance from the Sun. It orbits it at a distance of about 19.2 astronomical units (2.87 billion kilometers), with a period of revolution of 84.05 Earth years. It is the fourth most massive planet in the Solar System and the third largest in…
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Neptune (planet)
Neptune is the eighth planet in order of distance from the Sun and the most distant known from the Solar System. It orbits the Sun at a distance of about 30.1 au (4.5 billion kilometers), with an orbital eccentricity half that of the Earth and a period of revolution of 164.79 years. It is the…
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Venus (planet)
Venus is the second planet in the Solar System in order of distance from the Sun, and the sixth largest in both mass and diameter. It owes its name to the Roman goddess of love. Orbital characteristics Semi-major axis 108,209,500 km (0.723,336 336 au) Aphelion 108,943,000 km (0.728 24 au) Perihelion 107,476,000 km (0.718 43…
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Moon
The Moon, or Earth I, is the only permanent natural satellite of planet Earth. It is the fifth largest natural satellite in the Solar System, and the largest of the planetary satellites relative to the size of the planet around which it orbits. It is the second densest satellite in the Solar System after Io,…
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Mercury (planet)
Mercury is the closest planet to the Sun and the least massive in the Solar System. Its distance from the Sun is between 0.31 and 0.47 units (or 46 and 70 million kilometers), which corresponds to an orbital eccentricity of 0.2 — more than twelve times that of Earth, and by far the highest for…
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Albert Einstein
Albert Einstein (March 14, 1879 – April 18, 1955) was a German theoretical physicist who developed the theory of general relativity, one of the pillars of modern physics alongside quantum mechanics. Although best known for its mass-energy equivalence formula, E = mc² — which was called “the world’s most famous equation” — was awarded the…
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Marie Curie
Maria Salomea Skłodowska-Curie, better known as Marie Curie or Madame Curie (7 November 1867 – 4 July 1934), was a Polish physicist and chemist. A pioneer in the field of radioactivity, she is the first and only person to receive two Nobel Prizes in different scientific specialties: Physics and Chemistry. She was also the first…
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Oxygen
Oxygen is the chemical element with atomic number 8, symbol O. It is the leader of the chalcogen group, often referred to the oxygen group. Discovered independently in 1772 by the Swede Carl Wilhelm Scheele in Uppsala, and in 1774 by Pierre Bayen in Châlons-en-Champagne as well as by the British Joseph Priestley in Wiltshire,…
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Gold
Gold is a chemical element with atomic number 79, symbol Au. This symbol, chosen by Berzelius, is formed from the first two letters of the Latin word aurum (of the same meaning). Symbol Au Name Gold Atomic number 79 Group 11 Period 6th period Block Block d Element family Transition metal Electronic configuration [Xe] 4…
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Iron
Iron is a chemical element with atomic number 26, symbol Fe. Symbol Fe Name Iron Atomic number 26 Group 8 Period 4th period Block Block d Element family Transition metal Electronic configuration [Ar] 4 S2 3D6 Electrons by energy level 2, 8, 14, 2 Atomic mass 55.845 ± 0.002 u Atomic radius (calc) 140 pm…