![]() ![]() 2023 As the name implies, a nuclear thermal engine would rely on a nuclear reactor, using a process called atomic fission - in which a neutron slams into an atom to rip it apart, setting off a powerful chain reaction - to heat up propellant and provide the thrust needed to propel a rocket through space. 2023 When a voltage is applied to the ferroelectric, the lattice of atoms may contract or stretch, altering the mechanical properties of the material as well as its thermal conductivity. Tim Newcomb, Popular Mechanics, 22 Feb. 2023 In one theory, a Big Bang event billions of years ago created a universe so new that atoms weren’t even a reality. 2023 In each form, its atoms occupy a very different volume than the preceding one. 2023 The reactor, known as a fast breeder, excels at making plutonium, a top fuel of atom bombs. 2023 Meanwhile, George Gamow, the first person to model the primordial formation of atoms, had other ideas. 2023 But here’s what was new: A team of scientists at the Chinese Academy of Sciences scanned 117 glass beads from Chang’e-5 and claimed most of them contained either water molecules or hydroxyls, molecules with an attached chemical group made of one hydrogen and one oxygen atom. Margaret Osborne, Smithsonian Magazine, 27 Apr. Recent Examples on the Web Viewers reported spectacular colors ranging from reds to greens and yellows-a variation caused by atoms of different elements reacting with the solar energy at different altitudes. ![]()
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