Quotes About Gravity

Ä°çinde bir parça kahkaha olmayan bir ciddiyet hakikaten hakiki olamaz.

The "gravity train" was devised in the seventeenth century by British scientist Robert Hooke, who presented the idea in a letter to Isaac Newton. The idea has been seriously presented a few times, such as to the Paris Academy of Sciences in the nineteenth century.

Water in space would be hugely valuable, far more so the gold, given the cost of hauling water up from Earth. On b moon, water would support life, and using electrolysis (pass ing an electric current through it) water can be broken dow into hydrogen and oxygen to make rocket fuel. The moon could become a filling station outside Earth's deep gravity field that could be used to support a general expansion ins the solar system, just as was dreamed of before Apollo.

It's the gravity that shapes the large scale structure of the universe, even though it is the weakest of four categories of forces.

Another prediction of general relativity is that time should appear to run slower near a massive body like the earth.

Black holes might be useful for getting rid of garbage or even some of one's friends.

one has a singularity contained within a region of space-time known as a black hole.

As a result, in more than three dimensions the sun would not be able to exist in a stable state with its internal pressure balancing the pull of gravity. It would either fall apart or collapse to form a black hole, either of which could ruin your day.

If you think it is hard to get humans to follow traffic laws, imagine convincing an asteroid to move along an ellipse.

Because gravity shapes space and time, it allows space time to be locally stable but globally unstable. On the scale of the entire universe, the positive energy of the matter can be balanced by the negative gravitational energy, and so there is no restriction on the creation of whole universes. Because there is a law like gravity, the universe can and will create itself from nothing in the manner described in Chapter 6.

My investigations revealed a deep and previously unsuspected relationship between gravity and thermodynamics, the science of heat, and resolved a paradox that had been argued over for thirty years without much progress: how could the radiation left over from a shrinking black hole carry all of the information about what made the black hole? I discovered that information is not lost, but it is not returned in a useful way—like burning an encyclopedia but retaining the smoke and ashes.

In the classical theory of gravity, which is based on real space-time, there are only two possible ways the universe can behave: either it has existed for an infinite time, or else it had a beginning at a singularity at some finite time in the past.

Jika Bumi berhenti berputar, maka menurut hukum Newton benda apapun yang tak terikat ke Bumi bakal terus bergerak dengan kecepatan perputaran Bumi (1100 mil per jam atau 1770 km per jam di khatulistiwa)

Eventually, however, the star will run out of its hydrogen and other nuclear fuels. Paradoxically, the more fuel a star starts off with, the sooner it runs out. This is because the more massive the star is, the hotter it needs to be to balance its gravitational attraction.

It also meant that whenever a body is not acted on by any force, it will keep on moving in a straight line at the same speed.

The mass of the sun curves space-time in such a way that although the earth follows a straight path in four-dimensional space-time, it appears to us to move along a circular orbit in three-dimensional space.

Among the heresies was the idea that nature follows laws, because this conflicts with God's omnipotence. Interestingly, Pope John was killed by the effects of the law of gravity a few months later when the roof of his palace fell in on him.

according to the laws of nature concerning gravity and motion – laws that are among the oldest in science – space itself is a vast store of negative energy. Enough to ensure that everything adds up to zero.

time and space are intertwined. It is something like adding a fourth direction of future/past to the usual left/right, forward/backward, and up/down. Physicists call this marriage of space and time "space-time," and because space-time includes a fourth direction, they call it the fourth dimension.

region of space-time known as a black hole.

we already knew that nothing could prevent a massive cold star from collapsing under its own gravity until it reached a singularity of infinite density. I realised that similar arguments could be applied to the expansion of the universe.

Newton realized that, according to his theory of gravity, the stars should attract each other

Newton gave us answers. Hawking gave us questions. And Hawking's questions themselves keep on giving, generating breakthroughs decades later. When ultimately we master the quantum gravity laws, and comprehend fully the birth of our universe, it may largely be by standing on the shoulders of Hawking." •

The story that Newton was inspired by an apple hitting his head is almost certainly apocryphal. All Newton himself ever said was that the idea of gravity came to him as he sat 'in a contemplative mood' and 'was occasioned by the fall of an apple.')