What is a black hole?

  A black hole is a region of space-time from which nothing, not even light, can escape. The theory of general relativity predicts that a sufficiently compact mass will deform space time to form a black hole. Around a black hole there is a mathematically defined surface called an event horizont that marks the point of no return. It is called "black" because it absorbs all the light that hits the horizon, reflecting nothing, just like a perfect black body in thermodynamics. Quantum mechanics predicts that black holes emit radiation like a black body with a finite temperature. This temperature is inversely proportional to the mass of the black hole, making it difficult to observe this radiation for black holes of stellar mass or greater. Black holes of stellar mass are expected to form when massive stars collapse in a supernova the end of their life cycle. After a black hole has formed it can continue to grow by absorbing mass from its surroundings. By absorbing other stars and merging with other black holes, supermassive black holes of millions of solar masses may be formed.

Do you know how many stars are in the Universe?

       A study by Yale astronomer Pieter van Dokkum just took the estimated number of stars in the universe. There are 100,000,000,000,000,000,000,000, or 100 sextillion but tripled it. He came out with this news in 2010, a big interesting discovery for humanity.  Van Dokkum’s study in the journal "Nature"  focuses on red drafts, a class of small, cool stars. They’re so small and cool, in fact, that up to now astronomers haven’t been able to spot them in galaxies outside our own. That’s a serious holdup when you’re trying to account for all the stars there are.But here are some secondary implications in we take a better look: more stars means more opportunities for life!!! 

                       Do you think there is any type of life in the universe???

Aurora From Orbit September 17, 2011

As we all know, an aurora is a natural light display in the sky particularly in the high latitude like Arctic and Antarctic regions, caused by the collision of energetically charged particles with atoms in the high altitude atmosphere. The charged particles originate in the magnetosphere and solar wind and are directed by the Earth's magnetic field into the atmosphere.

This gorgeous view of the aurora was taken from the International Space Station as it crossed over the southern Indian Ocean on September 17, 2011. The sped-up movie spans the time period from 12:22 to 12:45 PM ET. 

NASA Announces Tweetup for Mars Rover Launch

In Pasadena, California, NASA will host a two-day launch Tweetup for 150 of its Twitter followers on November 23 and 25 at the agency's Kennedy Space Center in Florida. This is expected to culminate in the launch of the Mars Science Laboratory Curiosity rover aboard a United Launch Alliance Atlas V 541 from Cape Canaveral Air Force Station. The launch window is scheduled to open at 7:21 a.m. PST (10:21 a.m. EST) on Nov. 25.The Tweetup will provide NASA's social media followers with the opportunity to tour Kennedy Space Center; speak with scientists and engineers; and, if all goes as scheduled, view the spacecraft launch. The event also will provide participants the opportunity to meet fellow tweeps and members of NASA's social media team.

How do you think everything started?

Three main observational results over the past century led astronomers to become convinced that the universe get started from a big explosion, named Big Bang. First they analyzed and found out that the separation between galaxies is getting larger and larger. Second, the abundance of helium and other nuclei like deuterium prove there was an explosion and third , astronomers observed the cosmic background radiation from every direction in the universe. This are the theories we use today to explain our beginning. But my question are: what do you think was before the Big Bang? Did the black matter existed forever? How do you thing looks the edge of our universe? This questions make me so curious and I would be so excited to hear interesting news from astronomers.

Hello!

I want to share with you few of the most important mysteries that composed our universe over the last 13,5 billion years.We will analyze and discuss the latest news about our sky, planet but also people. The universe is commonly defined as the totality of everything that exist, including all space, time, matter energy, planets, stars, galaxies, intergalactic space. I want to find a way of including every single step that brought us here ,from the Big Bang to the complex cells that are part of us.This blog will include Biology,Geology but also unsolved mysteries. :)

     
              Hope you will enjoy it !!! :)