BLACK HOLE AND DARK MATTER
What we can observe in our sky planets, stars, gas and dust , galaxies, nebulae, asteroids, meteors, and more-is a small fraction of what exists. Bright matters, the visible stuff of the universe, forms only about a sixth of its mass.
What forms the rest, how do we know its 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 matters
Believed to constitute about 95 percent of the universe total mass, dark matter and dark energy may comprise unfathomable numbers of tiny subatomic particles. Candidates for dark matter include cold dark matter (CDM), sluggish elementary 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 Gravitational pull suck gases and dusts toward itself, forming a whirling accretion disk around the hole. The disks heats any matter that crosses it, emitting X-RAYS (opposite).
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Nice
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