Dumont d’Urville TS3 Students HODZIC Amir SILAS Hervé

Present

Black Holes

Summary 1°) Do black holes really exist ? 2°) What are the characteristics of black holes ? 3°) Could a black hole threaten the Earth ?

I°) Do Black Holes really exist ? Black holes are for some people merely science fiction. Yet, scientists have many reasons to believe in their existence.

4 ways of detecting black holes The higher velocity of stars around black holes. The emission of powerful X-ray.. The presence of masses of gas and dust.

4 ways of detecting black holes The higher velocity of stars around black holes. The emission of powerful X-ray.. The presence of masses of gas and dust. The emission of plasma jet

Two similar detectors : New technologies Two similar detectors : VIRGO & LIGO

II°) What are the characteristics of black holes ? Three main characteristics

II°) What are the characteristics of black holes ? Three main characteristics Different steps of black holes formation

1°) Stellar black holes Red giant

1°) Stellar black holes Red giant White dwarf

supernova Implosion Explosion Residue

1°) Stellar black holes Red giant White dwarf Neutron star Black hole

2°) Galactic black holes Event horizon : 10 billion large kilometers Resides in the center of galaxies

III°) Could a black hole threaten the Earth ?

1°) If the sun turned into a black hole ? What would happen : 1°) If the sun turned into a black hole ?

2°) With the black hole in our What would happen : 2°) With the black hole in our Milky Way ?

3°) If two supermassive black holes collapsed What would happen : 3°) If two supermassive black holes collapsed

THE END