Observable sky is what we can see such as sun, stars, planets,asteroids,meteors ,gas, dust, Galaxy and more but this comprises only one sixth of total mass of universe. Then what forms the rest ?
Scientists know there must be more out there that can't be seen but the unseen substance has gravity and appears to be holding the parts of universe. As the unseen matter doesn't emit radiation scientist call it dark matter .It is believed dark matter constitute 95 percent of total mass.
Dark matter includes cold dark matter, weakly interactive massive particles, heavy hypothetical particles that rarely interact with other matter an massive compact halo objects. This dark matter give rise to another topic black hole.
Scientists know there must be more out there that can't be seen but the unseen substance has gravity and appears to be holding the parts of universe. As the unseen matter doesn't emit radiation scientist call it dark matter .It is believed dark matter constitute 95 percent of total mass.
Dark matter includes cold dark matter, weakly interactive massive particles, heavy hypothetical particles that rarely interact with other matter an massive compact halo objects. This dark matter give rise to another topic black hole. 
Black hole- A black hole forms when a large dying star collapses. The gravity created by this condensing particle overpower any outward forces including light. Although a black hole emits no light its presence is detectable by radioastronomy equipment .Its extremely strong gravitational pull sucks gas and dust towards itself forming a whirling accelerating disk around the hole.
Worm hole - 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 last only for brief moment that joins two black holes. In worm hole 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.
Till now neither wormholes nor any evidence of them has been observed .Scientists cannot determine how they would be created .Although some astrophysicist continue to work on this.
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