Titlebook: Astronomy Explained; Gerald North Book 1997 Springer-Verlag London Limited 1997 Accretion.astronomy.cosmology.earth.gravitation.moon.neutr

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Astigmatism

The Telescope, that one day in 1608 he noticed that if he looked through a pair of spectacle lenses, held one in front of the other, he saw distant objects magnified. However, evidence has come to light in recent years which suggests that the telescope was invented some years earlier, though things are still far

Medley

Gravitation,re and properties. Three of the four — the strong nuclear, the weak nuclear and the electromagnetic/electrostatic — are mainly concerned with the small-scale structure of matter. These forces are strong but operate over very small ranges. The other force is gravitation. In terms of magnitude, gravit

stressors

BLINK

Demonstrate

FRONT

The Twilight Zone of the Solar System,lar System consisted of just these five planets plus the Earth, the Sun and the Moon. Then, in 1781, the academic world received a rude shock when an amateur astronomer discovered another planet with his home-made reflecting telescope!

nocturnal

The Debris of the Solar System,n able to begin the task of unravelling the history of the Solar System and to fit the great variety of objects into the story of its early formation. Our ideas are still rather sketchy, but in their basic outline are unlikely to be very far wrong.

critique

The Comets,a comet. Comets used to be regarded as the portents of doom and tragedy and many a bright comet has caused widespread panic. For instance, a bright comet caused alarm in the England of 1665, in the early weeks of the Great Plague. Another appeared in 1666 just before the Great Fire that was to purge

惊呼