Imagine a boat on a large boat, distant orography with remote water, with such dready soils. In the morning, before dawn, and the intense cloud goes through the coast. As chillies like your first watch watches, you get from your corner of the eye a lighthouse that crosses the fog.
And yes! The other lighthouse, closer, slightly stronger. When scanning, we point out more lighthouses to the more remote coastal dangers.
You know this coast when you return from the same port of the same year. You know that the lenses are the same, the same fabrication is maintained and the proper operation is maintained throughout the year.
And so spend some time playing to pass. Advice on your charts, you know the distance of each lighthouse, and the extent to which the light reaches your salt eyes. But in the afternoon it blinks light and bright and bright. You know how bright they are it should be Because, and you can compare this brightness to what you see, peering through layers and layers of clouds, how much is the amount of fog hugging on the coast.
No need to do anything
This is precisely the procedure used by astronomers to measure the total amount of the universe, at least, of course, fog and lighthouses and seafood.
Our cosmic beacons are active galaxies, the most powerful motors of the universe, which generate giant black holes, compress and heat up to close the event horizontally before swallowing radiation. In their death, these gigantic and chaotic galaxies emit more energy than millions of galaxies and lighten the whole universe.
When they are lit in the young cosmos, they appear as lighthouses, bright and shiny.
It is everything between these lighthouses and telescopes thing in the universe The majority of the universe is void, but the fulfillment of gaps has been the accumulated light of the generations of two stars that have survived for a long time and survive, the light of the cosmos in a photon fog and thin.
Radiation from active radiation galaxies is very high energy – it's not surprising, giving a great deal of origin. And because it blasts the energy of the universe through the universe, this thin fog finds it. Interaction option interaction, random randomized interruption of conversation, so that high-energy radiation will not lose energy and fraction.
After analyzing more than 700 galaxies, astronomers could calculate all the stars produced throughout the world and the time of the cosmic, until the time of the first stars was less than 500 million years ago. now close Rough counting 4 × 10 ^ 84 photons, that's … a lot.
The budget for this extra budget for this budget is in agreement with other extraneous calculations, but it is buried in this last observation and others are a sharp discovery: our universe is dying.
Comparing the light of various active galaxies located in different distances, astronomers could not only calculate the total amount of a star's star, but that star shines and flows into more than one cosmic history.
And the news is that the lights come out one by one. It should be highlighted that, among many observations and estimates, our universe was more than 9 million years old when the formation of stars prevailed, because the cosmos was just one quarter of today.
The exact reason still denounces us. Certainly, in our vast universe there is something like this; The galaxies are moving away from each other, with fewer fuses and galaxies that supply more fresh material to make the new gas become a star. But why was the peak at that time long ago? Why was the formation of stars so quickly created? Or maybe, why were the stars long ago, despite the collapse of the empire again?
Unresolved question questions. Right now, at least, we still have a fog.
Read more: "Determination of the star formation of the universe".