Quotes About Time

In a trillion or so years, anyone alive in our own galaxy may know nothing of other galaxies. Our observable universe will merely comprise a system of nearby, long-lived stars within the Milky Way. And beyond this starry night will lie an endless void—darkness in the face of the deep.

If that's how you want invoke your evidence for God, then God is an ever receding pocket of scientific ignorance that is getting smaller and smaller and smaller as time goes on.

adding travel time lost during the pit stop between photon absorption and re-emission, the total trip lasts about a million years. If a photon had a clear path from the Sun's center to its surface, its journey would instead last all of 2.3 seconds.

There's a variation of the ever popular multiverse idea in which the multiple universes that comprise it are not separate universes entirely, but isolated, non-interacting pockets of space within one continuous fabric of space time - like multiple ships at sea, far enough away from one another so that their circular horizons do not intersect. As far as any one ship is concerned (without further data), it's the only ship on the ocean, yet they all share the same body of water.

We've come a long way since Herschel's experiments with rays that were "unfit for vision," empowering us to explore the universe for what it is, rather than for what it seems to be. Herschel would be proud. We achieved true cosmic vision only after seeing the unseeable: a dazzlingly rich collection of objects and phenomena across space and across time that we may now dream of in our philosophy.

In the beginning, nearly fourteen billion years ago, all the space and all the matter and all the energy of the known universe was contained in a volume less than one-trillionth the size of the period that ends this sentence.

nearly fourteen billion years ago, all the space and all the matter and all the energy of the known universe was contained in a volume less than one-trillionth the size of the period that ends this sentence. Conditions

A millionth of a second has passed since the beginning. This tepid universe was no longer hot enough or dense enough to cook quarks, and so they all grabbed dance partners, creating a permanent new family of heavy particles called hadrons (from the Greek hadros, meaning "thick").

By now, one second of time has passed. The universe has grown to a few light-years across,†† about the distance from the Sun to its closest neighboring stars.

The universe today is 13.8 billion years old. By 22 billion years, the Sun will have finished its main-sequence lifetime and will have become a white dwarf. The Andromeda galaxy will have crashed into the Milky Way.

We are seeing these nearby stars, not as they are at the present moment, but as they were 4 years ago

The future is 1/39 as long as the past.

When I pause and reflect on our expanding universe, with its galaxies hurtling away from one another, embedded within the ever-stretching, four-dimensional fabric of space and time, sometimes I forget that uncounted people walk this Earth without food or shelter, and that children are disproportionately represented among them.

Astrobiologists now believe that the existence of life throughout the universe requires: 1. a source of energy; 2. a type of atom that allows complex structures to exist; 3. a liquid solvent in which molecules can float and interact; and 4. sufficient time for life to arise and to evolve.

Earth's oceans will boil away about a billion years

No day before October 10, 1582, actually occurred on the Gregorian calendar for that was when the calendar was implemented officially.

The Physics of Immortality

going through a wormhole or (as we shall see) by going around a cosmic string.

But because the particle shower moves so fast relative to us and our detectors on Earth's surface, the muons experience the passage of time more slowly than we do.

If you travel fast, several weird things happen. One is that your inner time clock will appear to tick more slowly, as seen by all those who observe you. Your time "dilates.

Al principio, era la física. La

hard to make a time machine out of normal material in your garage by only gently curving spacetime

At the altitude of about 23,000 miles the satellite takes 23 hours and 56 minutes to orbit Earth. Earth takes 23 hours and 56 minutes to rotate.

El físico teórico estadounidense del siglo XX John Archibald Wheeler lo expresó de mejor forma, resumiendo el concepto de Einstein como: "La materia le dice al espacio cómo curvarse; el espacio la dice a la materia cómo moverse".4