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Per Aspera Ad Astra (1910–1917)
Sitting at his desk in Queen’s College at Oxford in England, Edwin Hubble studied with grave intensity the telegram in his hand. It was from his...
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Rising Stars (1923-1927)
When the Great War finally reached its conclusion with much of Europe in ruins, the next phase of American economic and political dominance on the...
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A Problem Manifests Itself
Already at the beginning of the twentieth century, a problem in the mass budget of large structures like our galaxy or galaxy clusters became...
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Concluding Remarks
For about a hundred years, there has been no satisfying answer to the question about the nature of the matter that dominates the universe. The...
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Introduction
If you search for answers to the question “What is dark matter?” in the information source of our time, the Internet, you will be well served...
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How Dark Matter Dominates our Model of Structure Formation in the Universe
As you have already read, there are many observations that suggest a dominant dark mass component in the universe. Through these observations and...
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Merging Orbits (1918-1922)
As 1918 began, Milton Humason was one of the most recognizable faces of all of those that appeared at Mount Wilson Solar Observatory (MWSO) and yet...
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From the Renaissance to Modern Science
We start in medieval times, briefly considering the prevailing world view and emphasising their version of Aristotelian physics. We then look at the...
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Classical Physics
In this chapter we will look briefly at pre-Newtonian gravity, before discussing Isaac Newton himself and his seminal role in the apogee of the...
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New Frontiers
Here we briefly discuss some open issues and frontiers of current research in cosmology and related areas. The reader is warned that many such issues...
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The Physics of Relativity
In this chapter we discuss Albert Einstein’s special and general theories of relativity. We start by a brief look at their origins, and then discuss...
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Classical Astronomy
In this chapter we focus on Classical and Hellenistic Greece, looking in detail at their astronomy (which was in part imported from Babylon and...
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Introduction
We will start with a brief discussion of the scientific method, highlighting what distinguishes science from other human endeavours and reflecting on...
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The Physics of the Universe
In this chapter we review our current view of the Universe, which is contained in what is called the Hot Big Bang model. We discuss its main...
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The Physics of Stars and Galaxies
In this chapter we will be considering in detail the astrophysical building blocks of the Universe, stars. We first overview their main physical...
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Was ist Zeit?
Der Wecker klingelt. Aufstehen! Wir starten in den Tag und planen unser Programm mit einem wesentlichen Werkzeug: der Uhr. Sie zeigt uns ganz...
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Die ersten Sterne
Bald nach dem Urknall begann eine „dunkle Ära“ des Universums, die rund 100 Mio. Jahre andauerte. Erst danach bildeten sich Sterne, und das All wurde...
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Die ferne Zukunft der Sterne
Manche meinen, die glorreichen Tage des Universums seien bereits vorbei – doch weit gefehlt! In den kommenden Milliarden und Billionen Jahren werden...
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Brisante Dunkle Energie
Eine Kraft treibt das Universum auseinander. Aber wie? Auch zwei Jahrzehnte nach seiner Entdeckung verstehen Theoretiker das Phänomen nicht. Nun...
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Erster Nachweis: Verschmelzende Neutronensterne
Ein Meilenstein für die Astronomie, ein Glücksfall für die Forschung: Erstmals gelang es, mit Gravitationswellen und in allen Bereichen des...