Have you ever wondered about exoplanets? Exoplanets are the planets outside of our solar system.
There are multiple methods used by astronomers to discover exoplanets. One of them is called the Transit Method. As planets orbit their stars in a mostly circular way, exoplanets will always pass in front of their own star (at least, to our own perspective). During a planet’s transit around its star, its effects will be somewhat similar to an eclipse. The amount of light given off by the star that is visible from Earth will decrease until the planet completes its transit. Using the data like the drop in the star’s brightness and how long the transit was, astronomers are able to make various calculations. Not only are they informed of the exoplanet’s existence, but they also discover the exoplanet’s distance to its star or how long its orbit takes. More than 3000 exoplanets have been discovered using the Transit Method to this date.
Still, though, there will always be mistakes in using this method as well as any other methods. There may be unseen details or simply missed periods of light differences by astronomers’ telescopes and graphs. There may always be unobservable celestial objects in our universe that may remain undiscovered. All we can do is try to discover as much of it as we possibly can.
I think it is very important that we discover more about this infinitely large universe we live in before other galactic clusters move out of our observable universe. This will eventually happen, as the universe is constantly expanding at an accelerating rate, moving an increasing amount of celestial objects out of our observable universe every moment.