Question 1:

What is one observational evidence for the existence of black holes?

Explanation: One observational evidence for the existence of black holes is the detection of intense X-ray emission from certain celestial objects, such as X-ray binaries and active galactic nuclei.

Question 2:

Which phenomenon supports the presence of a black hole at the center of our galaxy?

Explanation: The observation of stars orbiting a dark, invisible object with a mass of millions of Suns supports the presence of a black hole at the center of our galaxy. This dark object is known as Sagittarius A*.

Question 3:

What is gravitational lensing?

Explanation: Gravitational lensing refers to the distortion of light caused by the gravitational pull of a massive object, such as a black hole. It can be used to indirectly detect the presence of black holes by observing the bending of light around them.

Question 4:

What is an accretion disk in the context of black holes?

Explanation: An accretion disk is a disk-shaped region of gas and dust that surrounds a black hole. As matter falls into the black hole, it forms a swirling disk, releasing energy in the form of intense radiation, including X-rays.

Question 5:

What is an event horizon telescope?

Explanation: An event horizon telescope is a network of telescopes used to observe black holes and capture their images. It combines data from multiple telescopes to create a virtual telescope with a resolution comparable to the size of the Earth.