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The Hubble eXtreme Deep Field (XDF) was completed in September 2012 and shows the farthest galaxies ever photographed at that time. Except for the few
The Hubble eXtreme Deep Field (XDF) was completed in September 2012 and shows the farthest galaxies ever photographed at that time. Except for the few stars in the foreground (which are bright and easily recognizable because only they have diffraction spikes), every speck of light in the photo is an individual galaxy, some of them as old as 13.2 billion years; the observable universe is estimated to contain more than 2 trillion galaxies.
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The beginning of Aristotle's Metaphysics, one of the foundational texts of the discipline
The beginning of Aristotle's Metaphysics, one of the foundational texts of the discipline
Immanuel Kant conceived critical metaphysics as the study of the principles underlying all human thought and experience.
Immanuel Kant conceived critical metaphysics as the study of the principles underlying all human thought and experience.
David Hume criticized metaphysicians for trying to arrive at knowledge outside the field of sensory experience.
David Hume criticized metaphysicians for trying to arrive at knowledge outside the field of sensory experience.
Boethius's theory of universals influenced many subsequent metaphysicians.
Boethius's theory of universals influenced many subsequent metaphysicians.