No exact number is known. Certainly many billions of them
We can see them in even average sized telescopes.
No. Some galaxies that old are visible.
The vast distances involved means that the light we see left those galaxies a long time ago.
The vast distances involved means that the light we see left those galaxies a long time ago.
With the naked eye, you can see some galaxies, like the two Magellanic Clouds, and the Andromeda Galaxy. The farthest objects visible in large telescopes would also be entire galaxies.With the naked eye, you can see some galaxies, like the two Magellanic Clouds, and the Andromeda Galaxy. The farthest objects visible in large telescopes would also be entire galaxies.With the naked eye, you can see some galaxies, like the two Magellanic Clouds, and the Andromeda Galaxy. The farthest objects visible in large telescopes would also be entire galaxies.With the naked eye, you can see some galaxies, like the two Magellanic Clouds, and the Andromeda Galaxy. The farthest objects visible in large telescopes would also be entire galaxies.
About 4 galaxies - all of them belonging to the Local Group - can be seen with the unaided eye. For other galaxies, that are either smaller or farther away, telescopes are used.
We can see more stuff.
Yes, with the help of powerful telescopes, scientists can observe and study objects outside of our galaxy, such as other galaxies, stars, and nebulae.
Large telescopes are used to study distant galaxies because they can gather more light, allowing for better resolution and the ability to detect fainter objects. Their larger size also grants them a greater light-gathering capacity, which is essential for observing objects that are billions of light-years away. Additionally, large telescopes offer higher sensitivity and better data collection capabilities, enabling astronomers to analyze and study distant galaxies in greater detail.
Ultraviolet telescopes are similar to optical reflecting telescopes, but their mirrors have special coatings that reflect ultraviolet light very well. Ultraviolet telescopes provide much information about interstellar gas, young stars, and the gaseous areas of active galaxies.
People commonly look through telescopes to see into space. Telescopes are used by NASA to see stars and planets very far away, and less sophisticated models are used to see planets in our solar system, or even the moon.
Observations of galaxies captured by telescopes like the Hubble Space Telescope show distorted shapes and tidal tails, indicating interactions and collisions between galaxies. Redshift data also reveals galaxies gravitationally interacting and merging as they move closer together in the Universe. Computer simulations based on astronomical models also support the theory of galactic collisions.