BLACK HOLESBy Ana morán

BEFORE STARTING. Main themes index:

1. HOW AND WHY ARE BLACK HOLES FORMED

• A black hole is a region in space where the pulling force of gravity is so strong that light is not able to escape. The strong gravity occurs because matter has been pressed into a tiny space. This compression can take place at the end of a star's

life. Some black holes are a result of dying stars.

. They are the remnants of a large star that dies in a supernova

explosion.

WHAT SIZE CAN BLACK HOLES BE?

• Black holes can be big or small. Scientists think the smallest black holes are as small as just one atom. These black holes are very tiny but have the mass of a large mountain. Mass is the amount of matter, or "stuff," in an object.

Another kind of black hole is called "stellar." Its mass can be up to 20 times more than the mass of the sun.

The largest black holes are called "supermassive." These black holes have masses that are more than 1 million suns together. There is a supermassive black hole at the center of the Milky Way galaxy is called Sagittarius. It has a mass equal to about 4 million suns.

INTERESTING FACTS

• Once particles and light-rays go past the event horizon, their light cones “tip over” and point to the singularity, which now represents all future-directed paths with no escape possible.

• The nearest black hole is 1,600 light years away. That is about 16 quadrillion kilometers for Earth.

WHAT ARE BLACK HOLES MADE UP OF?

• The simple answer is that we don’t know. A black hole is defined as a region of spacetimefrom which extremely strong gravity prevents anything, including light, from escaping.

• Other scientists say that black holes are made up of stars.

• From my point of view that can be possible because a black hole is made up of a supernova explosion.

IMAGES OF BLACK HOLES

WEBSITES WHERE YOU CAN FIND MORE INFORMATION

• http://science.nasa.gov/astrophysics/focus-areas/black-holes/

• http://www.nasa.gov

THANKS FOR YOUR

ATTENTION