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15 hours ago · The Sun is the star at the center of the Solar System. It is a massive, hot ball of plasma, inflated and heated by energy produced by nuclear fusion reactions at its core. Part of this energy is emitted from its surface as visible light, ultraviolet, and infrared radiation, providing most of the energy for life on Earth.
- Simple English
Sun. The Sun, also known as Sol, is a star at the center of...
- Stellar Evolution
Representative lifetimes of stars as a function of their...
- Planetary Nebula
X-ray/optical composite image of the Cat's Eye Nebula (NGC...
- Plasma
Plasma (from Ancient Greek πλάσμα (plásma) 'moldable...
- Solar System
The Solar System is the gravitationally bound system of the...
- Sungazing
Sungazing is the unsafe practice of looking directly at the...
- Simple English
15 hours ago · 1983 (7th Session) Area. 38,160.87 ha. Machu Picchu is a 15th-century Inca citadel located in the Eastern Cordillera of southern Peru on a 2,430-meter (7,970 ft) mountain ridge. [2] [3] Often referred to as the "Lost City of the Incas", it is the most familiar icon of the Inca Empire. It is located in the Machupicchu District within Urubamba ...
- c. 1450; 573 years ago
- Cusco Region, Peru
- 1983 (7th session)
- Latin America and the Caribbean
15 hours ago · Cholera ( / ˈkɒlərə /) is an infection of the small intestine by some strains of the bacterium Vibrio cholerae. [4] [3] Symptoms may range from none, to mild, to severe. [3] The classic symptom is large amounts of watery diarrhea lasting a few days. [2] Vomiting and muscle cramps may also occur. [3]
- 28,800 (2015)
