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Extra info for Back to Nature - Handbuch für Malawi Buntbarsche 2. Auflage

Sample text

We have no idea. At any rate, when cosmologists speak of the cosmic ‘mass density’, it is significant they make it constitute only around a third of the whole, including in it only baryonic and dark matter (see, for example, Peebles and Ratra, 2003). It does not include dark energy. Also, the implications of the term ‘vacuum’ ought not to be forgotten: it presumably means that the relevant space is ‘empty’. Empty of what? Presumably of rest mass. To all appearances, dark energy as a property of the vacuum would have been present in the ‘vacuum’ even if there had never been any rest mass at all.

Many suggestions were forthcoming, among them the possibility that Newton’s equations might 4 5 In that regard, the repulsive ‘gravity’ of infl ation has the opposite effect to that of the attractive gravity involved in gradually slowing the motions consequent to the original ‘big bang’. Recent measurements of small anisotropies in the cosmic microwave background by the Wilkinson Microwave Anisotropy Probe (WMAP) satellite offer strong confi rmation for this important claim. 30 Ernan McMullin have to be modified in order to apply over such enormous distances.

The ‘matter’ of the change is that which remains throughout – but it also, crucially, is the bearer of potentiality. Green leaves, though not brown, have the distinctive potentiality to turn brown at some point. This is something real about leaves, a potentiality that is crucial to our understanding of what leaves are. This important moral is one that may be drawn from every sentence that denotes a change. The world for Aristotle was made up of substances, unities that exist in their own right as living things do.

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