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Hubble's Law      Origin      American astronomer Edwin Hubble created Hubble's Law. You may have heard the name Hubble from the Hubble Space Telescope telescope. During the 1920s, Hubble noticed (through the Hale telescope at Mt. Palomar) that the galaxies were moving away from us. Their recession velocity was greater the further away they were from us. He discovered that the recession velocity and distance to that galaxy gave a fairly linear slope. That is Hubble's Law. Explaining Hubble's Law     Hubble's Law is v = H0D (recessing velocity = Hubble constant × proper distance). To find the Hubble constant, astronomers need to find out how fast the astronomical object moves away from us and the distance to it.  Vocabulary:  Doppler Effect - change in wavelength. Redshift - an increase in a wavelength.  Absorption lines - the patterns of light emitted from an object.  Recession Velocity - the rate at which an astronomical objec...

The Big Bang Origin of the Theory      The big bang was an explosion that started space and time and birthed the universe. We don't know how or what happened before and only know what happened after. The big bang theory (not the show) originated from the mind of Belgian cosmologist Georges Lemaitre after noticing that the universe was expanding. He figured that if the universe was expanding (because Hubble was using a telescope and noticed that the universe was expanding), the universe had to start at an infinitely small point. George Gamow and his colleagues further developed the theory during the 1950s. Gamow and many other physicists used Hubble's law to prove it. Hubble's law is v = H0D (recessing velocity = Hubble constant × distance) which means the universe is expanding. Many people disagreed with this, like Fred Hoyle, creator of the steady-state theory, which says that matter will continue being created as the universe expands. It's similar to the big bang theo...

 The Solar System      The solar system is where planet Earth lies with other planets and objects. The solar system consists of the Sun, planets such as Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune, dwarf planets like Pluto, the Asteroid and Kuiper belt, the moons/satellites like our moon, and comets. The Sun is, of course, the most prominent object in the solar system. It controls everything around it because of its gravitational pull and significant mass. Our solar system has eight planets which are split into two different groups. The inner planets- Mercury, Venus, Earth, and Mars- are solid bodies of rock and metal, while the outer planets- Jupiter, Saturn, Uranus, and Neptune- are gas giants made mostly of helium and hydrogen. There are five known dwarf planets in our solar system. There may be more; we don't know. Dwarf planets aren't classified as planets because of their low mass, volume, and weak gravity. The Asteroid belt is a group of ...

 Black Holes Origin The theory of relativity, created by Albert Einstein, presented the idea of black holes, implying that a compressed mass would distort space and create a black hole. Nonetheless, it originated from a letter John Michell wrote about an object so massive that light could not escape it. Scientists began wondering if black holes existed because the math predicted them to exist, but there was no proof. We got a visual confirmation of black holes in mid-2019 when the Event Horizon Telescope collaboration (EHT) captured a blurred image of a black hole. How a Black Hole is Formed      When a supergiant star dies and runs out of fuel, it explodes, leaving its core. This explosion causes a supernova (not all massive stars create a supernova). The core can't resist the crushing force of its gravity, so it collapses on itself, shrinking till it is infinitely smaller than an atom. A singularity is when an object is so unimaginably small that it has no size but...