1. BLACK HOLE Cindy,Robin, Selina

2. A black hole is a place in space where gravity pulls so much that even light can not get out. The gravity is so strong because matter has been squeezed into a tiny space. This can happen when a star is dying. Because of its high density, the gravity is particularly strong. According to classi cal black hole theory, the gravitational field aro und such objects is so great that nothing, not even lig ht, can escape from their t enacious grip.So We were unable to observe the refle ction of light it can only be affected by surrounding o bjects to indirectly underst and the black hole.

3. Q&A

4. 1. What is the black hole? A black hole is one of the strangest objects in space. It is an area in space where gravity is so strong that even light cannot escape from it.

5. 2.How big is a black hole? Black holes come in many sizes and their size depends on how much material is in them (their mass). Some are the remains of a giant star which collapsed. A star has to be much more massive than our Sun to become a black hole.

6. 3. How are black holes detected? Black holes are detected as surrounding material (like gas) is funneled by the force of gravity into a disk around the black hole. molecules in the disk swirl around the black hole so fast that they heat up and emit X-rays. These X-rays can be detected from Earth. Black holes can also be detected by watching for motions of stars near the black hole.

7. 4.Are there really black holes in space? Since black holes do not put out any light, we cannot see them. However, we can see the effect that they have on the area of space around them. Since black holes have extremely high gravity, they pull in surrounding material at very high speeds, causing this material to become very hot and emit X-rays. By finding this very hot material which is spiraling into black holes, astronomers can identify where some of them are.

8. 5.Could the Sun become a black hole? No, the Sun is much too small to ever become a black hole. A star has to be much more massive than the Sun before it can collapse into a black hole.

9. 6.How big is a black hole? Black holes come in many sizes and their size depends on how much material is in them (their mass). Some are the remains of a giant star which collapsed. A star has to be much more massive than our Sun to become a black hole.

10. Will the Black hole swallow the Earth?

11. Thank you for listening~