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The age of the Solar System, including Earth, was determined, and it turned out to be much older than believed earlier: more than 4 billion years, rather than the 20 million years suggested by Lord Kelvin in 1862. [2] The planets of the Solar System and their moons were closely observed via numerous space probes.
Example of the early Greek symbol for zero (lower right corner) from a 2nd-century papyrus; 499: Aryabhata gives a new symbol for zero and uses it for the decimal system. 499: Aryabhata discovers the formula for the square-pyramidal numbers (the sums of consecutive square numbers). [80]
1930s in science (20 C, 18 P) 1940s in science (21 C, 13 P) ... Pages in category "20th century in science" The following 115 pages are in this category, out of 115 ...
[114] [115] Maya writing, which was developed by 200 BCE, widespread by 100 BCE, and rooted in Olmec and Zapotec scripts, contains easily discernible calendar dates in the form of logographs representing numbers, coefficients, and calendar periods amounting to 20 days and even 20 years for tracking social, religious, political, and economic ...
Hence, the progress of one era, termed a "golden age" has appeared to mark the completion of physics as a science. Yet, this perception has turned out to be erroneous. For example, around 1980, Stephen Hawking predicted the end of theoretical physics within 20 years. Around 2001, he amended his prediction to twenty years more from that year.
2008 – 16-year study of stellar orbits around Sagittarius A* provides strong evidence for a supermassive black hole at the centre of the Milky Way galaxy; 2009 – Planck begins observations of cosmic microwave background; 2012 – Higgs boson found by the Compact Muon Solenoid [12] and ATLAS [13] experiments at the Large Hadron Collider
Merton believed that it is multiple discoveries, rather than unique ones, that represent the common pattern in science. [4] Merton contrasted a "multiple" with a "singleton"—a discovery that has been made uniquely by a single scientist or group of scientists working together. [5] The distinction may blur as science becomes increasingly ...
0s: 1st century in science; 100s: 2nd century in science; 200s: 3rd century in science; 300s: 4th century in science; 400s: 5th century in science; 500s: 6th century in science; 600s: 7th century in science; 700s: 8th century in science; 800s: 9th century in science; 900s: 10th century in science; 1000s: 11th century in science; 1100s: 12th ...