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Highly energetic particles from outer space travelling at the speed of light, known as cosmic rays, originate from the sites of extreme particle acceleration in the Universe.
There is a seismic shift underway in economics, hastened by the aftermath of the Covid-19 pandemic. Communities and countries around the world are beginning to adopt/consider adopting well-being and prosperity as major guiding principles.
The baby boomers have accumulated assets and have generous occupational pensions. Should they pass these assets to their descendants, with the risk of growing inequality, or should they be taxed to benefit society as a whole? Is inheriting morally dangerous? Or are inheritance taxes theft?
When light is dispersed into its constituent colours, it can become possible to discern rich dynamical information about an evolving system in space, for example cosmic explosions, collisions or accelerations.
In 1930, the great physicist Wolfgang Pauli invented a new particle to save the principle of energy conservation in certain radioactive decays he was studying.
Over the last 30 years, digital technology produced an exponential increase in astronomical data. Within our lifetime, the entirety of the visible universe will have been mapped out: we will have seen everything there is to see. The question will then be: what does it all mean?
Accounts of occasional celestial spectacular events in past centuries have provided crucial information for modern-day astrophysicists. One such example is the so-called Great Eruption of Eta Carinae which was for a time in the mid 19th century the third brightest object in the night sky.
How has Covid-19 re-shaped our ideas about what we owe society? The lockdown has had a terrible impact on the economic prospects of young people, and the elderly have suffered from high mortality in care homes.
Well-trained eyes can be remarkably useful for capturing light curves of evolving objects in the cosmos, even contributing to modern research programmes.
At longer wavelengths than the normal optical wavelengths to which human eyes are normally sensitive, is the radio part of the electromagnetic spectrum.