BLACK HOLES AND DARK MATTER

What we can observe in our sky ,planet , stars, gas,dust,galaxies, nebulae,asteroids,meteors and  more is a small fraction of what exists. Bright matter ,the visible stuff of the universe , form only about a sixth of its mass . what forms the rest , and how do we know it's there?   

Scientists know there must be more out there than meets the eye because the unseen substance has gravity and appears to be holding together the parts of the universe that we can see. galaxies in particular. Because the unseen matter does not emit radiation, scientists call it dark matter.  

             Believed to constitute about 95 percent of the universe's total mass, dark matter and dark energy may comprise unfathomable numbers of tiny sub atomic particles. Candidates for dark matter include cold dark matter (CDM), sluggish elementary particles; weakly interacting massive particles (WIMPS), heavy hypothetical particles that rarely interact with other matter; and massive compact halo objects (MACHOS), known objects such as planets, neutron stars, and white dwarfs that are presumed to be in the halos of galaxies.

                                                               

                                      what is a black hole ?

     A black hole forms when a large , dying star collapses . The gravity created by this condensing matter completely overpowers any outward forces, including light .Although a black hole emits no light , its presence is detectable by radioastronomy equipment .Its extremely strong gravitation pull sucks gas and dust towards itself ,forming a whirling accretion disk heats any matter that crosses it , emitting x-rays(opposite).

                                  whats is wormhole?

  A highly speculative idea of modern astrophysics. wormholes are theoretical possibilities allowed within the mathematical framework of Einstein's general theory of relativity. A wormhole is a short-lived portal, lasting only a brief moment. that joins two black holes in different locations. Wormholes could connect two points in the present-day universe or, perhaps. in different times. In wormhole theory. matter falling into a black hole at one point should emerge through a proposed “white hole”the reverse of a black hole at the other end. 

Neither wormholes nor any evidence of them has yet been observed. Scientists cannot determine how they would be created, although astrophysicists such as Hawking continue to work on this intriguing notion.