These 'green pea' galaxies might have helped to end the Universe's dark age

Expansion of the UniverseThe universe is constantly changing. Scientists have discovered that the universe is expanding, meaning that galaxies are moving away from each other over time. This idea was first supported by the work of Edwin Hubble, who observed that distant galaxies appear to be moving away from Earth.The expansion of the universe helps scientists understand how the universe began and how it might change in the future. One major idea that explains this expansion is the Big Bang...

Big BangScientists believe that the universe began about 13.8 billion years ago with an event called the Big Bang. This theory explains how the universe started as a tiny, hot, and dense point before expanding outward. Over time, matter spread out, forming galaxies, stars, and planets.The Big Bang theory is supported by scientific evidence, including the movement of galaxies, the presence of leftover radiation from the early universe, and the amount of certain elements found in space.

GalaxiesA galaxy is a massive system of stars, gas, dust, and dark matter held together by gravity. The universe has billions of galaxies, each containing millions or even trillions of stars. Galaxies come in different shapes and sizes, including spiral, elliptical, and irregular forms. Our own galaxy, the Milky Way, is a spiral galaxy that contains our solar system. Studying galaxies helps scientists understand the universe's structure and how it has evolved over billions of years.Science and...

UniverseThe universe is everything that exists, including galaxies, stars, planets, and all of space itself. It is constantly expanding, and scientists estimate that it is about 13.8 billion years old. The universe contains billions of galaxies, each made up of billions of stars and planets. Studying the universe helps scientists understand where we come from, how stars and planets form, and what might exist beyond our solar system.Science and Engineering Practices (SEP): Analyzing and...

Although black holes were theoretically postulated in the 1920s, they remained outside the domain of observational astronomy until the 1970s.
Their closest cousins are neutron stars, which are composed almost entirely of neutrons packed against each other, making them extremely dense. A neutron star has the same mass as the Sun but its diameter is only a few kilometers. Therefore, the escape velocity from their surface is close to the speed of light.
Not until the 1960s, when the first neutron...

In 1905, Albert Einstein published his special theory of relativity. According to this theory, no matter in the universe can attain a speed greater than the speed of light in a vacuum, which thus serves as the speed limit of the universe.
This has been verified in many experiments. However, space and time are no longer absolute. Two observers moving relative to one another do not agree on the length of objects or the passage of time. The mechanics of objects based on Newton's laws of...