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During the later stages of World War II, the entire Cold War, and to a lesser extent afterwards, uranium-235 has been used as the fissile explosive material to produce nuclear weapons. Initially, two major types of fission bombs were built: a relatively simple device that uses uranium-235 and a more complicated mechanism that uses plutonium-239 ...
The Big Bang is a physical theory that describes how the universe expanded from an initial state of high density and temperature. [1] It was first proposed as a physical theory in 1931 by Roman Catholic priest and physicist Georges Lemaître when he suggested the universe emerged from a "primeval atom".
For example, in 1970, tickets cost $1.55 or about $6.68 in inflation-adjusted 2004 dollars; by 1980, prices had risen to about $2.69, a drop to $5.50 in inflation-adjusted 2004 dollars. [24] Ticket prices have also risen at different rates of inflation around the world, further complicating the process of adjusting worldwide grosses. [22]
Around this time, SpaceX changed their naming scheme from "SN" to "Ship" for Starship crafts, [125] and from "BN" to "Booster" for Super Heavy boosters. [126] A month later, using cranes, Ship 20 was stacked atop Booster 4 to form the full launch vehicle for the first time; Ship 20 was also the first craft to have a body-tall heat shield. [39]
The differing sizes of other nations' banknotes is a security feature that eliminates one form of counterfeiting to which U.S. currency is prone: Counterfeiters can simply bleach the ink off a low-denomination note, such as a $1 or $5 bill, and reprint it as a higher-value note, such as a $100 bill.
By mole fraction (i.e., by quantity of molecules), dry air contains 78.08% nitrogen, 20.95% oxygen, 0.93% argon, 0.03% carbon dioxide, and small amounts of other trace gases. [2] Air also contains a variable amount of water vapor , on average around 1% at sea level, and 0.4% over the entire atmosphere.
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