Astronautics covers an extremely wide range of scientific and technical studies, from the chemistry of propellant mixtures (pergols), the study of materials and fluid mechanics to experiments in space biology,…
Astrophysics
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Modern Times
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At the turn of the twentieth century, Lorentz understood the futility of mechanical support to explain the propagation of the electromagnetic field. He also discovered the theory of electrons. Meanwhile,…
Kepler’s Laws
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A decisive step was taken in the seventeenth century by Johannus Kepler in Germany, a renowned mathematician, the founding father of modern astronomy. Protestant of confession and thus little concerned…
The Defense Projects of Earth
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If the risk of a near-miss becomes too high, it remains to be seen whether we will rely on the know-how of Bruce Willis’ bottom drillers or rather consider a…
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Where do the cosmogenic nuclides found in certain meteorites come from? As we have explained, the first source of nuclides are cosmic rays. Their properties show that they can in…
Interpretation of Measures
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Getting values and understanding their meaning and in particular determining the exact age of a rock since its solidification involves very good knowledge of the subject. The sources of errors…
Metamorphism and Age
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In addition to long-life radionuclides, a number of short-life radionuclides were present in the primitive solar system. Most of them have half-lives below a few million years. They have been…
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