There's an Emergency, Call Someone: What are Cosmic Events?
- Mar 20
- 7 min read
Updated: Mar 23
The most breathtaking details of our universe are happening far beyond Earth. Of course, we now have the technology to observe them and keep our knowledge of the universe up-to-date. Thanks to artificial satellites and massive observatories, we have explored more of space than our oceans. In such a situation, it is my duty as the Galaxy Explorer to convey this information to you in the easiest way possible. Now, let's get to the point: what are cosmic events? This blog will be like my legendary glossary of space terms. I will add to it as I make new discoveries. Put on your special space goggles and buckle up because we're taking off!
Contents
What are Cosmic Events?
Cosmic events are all constructive and destructive events that occur in the universe. Examples include the formation of stars and planets, black holes, supernova explosions, and eclipses. These space events fundamentally result from the movement of mass and the combination of energy. In short, the answer to the question "what is a cosmic event?" can be given as "all movements occurring outside of any given planet."
What are cosmic events?
Cosmic events are listed in detail as follows:
Star Formation
Planet Formation
Galaxy Formation
Black Hole Formation
Formation of the Atmosphere
Star Collision
Planetary Collision ++ Galactic Cannibalism
Galaxy Collision
Black Hole Collision
Supernova Explosion
Gamma-ray bursts
Solar Eclipse
Lunar Eclipse
Axial Tilt
Roche Limit
Orbital Resonance
Solar Flares
Gravitational Force (Earth's Force)
Magnetic Storms
Greenhouse Effect
Expansion of the Universe
Great Attractor
Now let's quickly explain what these cosmic events are.
Star Formation
Stars form when a cloud of dust in space begins to collapse in on itself. The collapsing matter gathers at one point, gaining gravitational force and attracting surrounding matter. Then, a small core forms, and this core continues to collect matter from its surroundings. After collecting enough matter, a bidirectional jet burst occurs from the core, and the star matures.
There are more stars in the universe than grains of sand on Earth, plus different types and classifications. All this information is available on a single page: What is a Star, How Do They Form? (Everything You Need to Know!)
Planet Formation
In a system, as a star forms, the outer parts of the matter cloud are not empty either, and small nuclei begin to form there as well. These first planets that form are called gas planets or outer planets. Planets form in a similar way to stars, but not as dramatically. After gas planets form, they begin to move away from the central star, and since there is less gas and more solid matter in the distance between them, terrestrial or inner planets form in this gap.
For those with more questions about planets, look here: What are Planets, How do they Form, Types and More.
Galaxy Formation
Galaxies are massive structures composed of millions or billions of celestial bodies, with a supermassive black hole at their center. Almost all planets are the same age because galaxies formed around the same time as the universe created.
If you want to learn about the mysteries of galaxies, let us direct you to: The Huge Neighborhoods of the Universe: What is a Galaxy?
Black Hole Formation
Black holes are structures formed when massive stars are pulled towards their centers and explode. Black holes are one of the strangest objects in the universe because light, even the fastest matter in the universe, cannot escape from the event horizon (the part of the black hole that we perceive as black). Black holes can also be formed as a result of the collision of two massive stars or neutron stars.
For those who want to know all the details about black holes: What is a Black Hole and How Does it Form? (All the Mysteries Here!)
Formation of the Atmosphere
Planets, due to their own gravity, hold onto the surrounding gases and drag them along in orbit. Since these gases cannot escape the object's gravity, they form a visible or transparent layer. Planets may have layered atmospheres similar to Earth's, or a negligible layer of gas.
This protective shield is actually multi-functional for planets; read more here: The Protector of Celestial Bodies: What is the Atmosphere?
Star Collision
In regions with high star density, often near galactic centers, stellar collisions can occur. These events, usually caused by differences in gravitational force, release enormous amounts of energy and can, in some cases, disrupt the balance of the surrounding environment.
Planetary Collision
Certain conditions are necessary for a planetary collision. The first is that planets, while still protoplanets (baby planets), collide due to the gravitational pull of other protoplanets in their vicinity. The second is due to orbital instability. A planet whose orbit is disrupted by some external factors may collide with another planet.
Galaxy Collision
Two galaxies, influenced by their gravitational pull, can slowly approach each other and collide or merge. Thousands of stars can form during this cosmic event because the matter density is very high during a collision. If one galaxy is smaller than the other, the larger one will absorb the smaller one.
Black Hole Collision
A black hole collision occurs when two black holes are moving towards each other, or if the smaller one is gravitationally drawn to the larger one. This event is so violent that cosmic levels of energy are released during the merger.
Solar Flares
Solar flares are bursts of energy caused by sudden and powerful magnetic activity on the Sun's surface. These flares release large amounts of radiation and energy, potentially affecting Earth's magnetic field and atmosphere. Solar flares can also trigger magnetic storms, which can disrupt satellite communications and power grids.
Supernova Explosion
Supernovae begin when massive stars run out of fuel and begin to swell. As the star swells, all its energy collapses into its center, resulting in a small or large explosion, proportional to its mass. This explosion can result in the formation of a black hole or a neutron star.
So what else happens after a supernova explosion? Read on to find out: Breaking News: An Explosion Occurred in Space! What is a Supernova?
Gamma-ray bursts
Gamma-ray bursts are the most energetic explosions in the universe and are usually caused by large cosmic events such as supernovae or the merger of neutron stars. These bursts release enormous amounts of energy in seconds and can be observed from distant regions of the universe. Gamma-ray bursts are critical for astronomers in understanding the early universe and the processes of star formation.
Solar Eclipse
A solar eclipse is the event where the Moon passes between the Earth and the Sun, partially or completely obscuring the Sun. During a total eclipse, the Sun's corona becomes visible, and this cosmic event causes a brief period of daylight darkness in certain regions. Solar eclipses are events of great interest to both scientific researchers and the general public.
For those who want to watch the solar eclipse and learn everything about it: Who Turned Off the Lights? What is a Solar Eclipse?
Lunar Eclipse
A lunar eclipse occurs when the planet's shadow falls on its natural satellite. This event happens on Earth only when the Moon is in its full phase and when Earth is in perfect alignment with the Sun. Lunar eclipses are visible to the naked eye, and a reddish discoloration is observed on the Moon's surface.
If you'd like to explore the wonder of the lunar eclipse further: Red Suits You So Well: What is a Lunar Eclipse and How Does it Occur?
Axial Tilt
Axial tilt is the angle of the Earth's rotational axis relative to its orbital plane, approximately 23.5 degrees. This tilt is a fundamental factor in the formation of seasons because it affects the angle at which sunlight strikes the Earth's surface. In the long term, axial tilt can also lead to climate change and ice ages.
So why do planets rotate in such a twisted orbit? The answers are here: My Dejected Posture is Because of This: What is Axial Tilt?
Roche Limit
The Roche limit defines the closest distance at which a satellite could be torn apart by a planet's strong gravitational forces. Within this limit, a satellite risks being torn apart by the planet's tidal forces.
I claim I explained the Roche limit better than anyone, let me hear your comments: Don't Come Too Close! What is Roche Limit?
Orbital Resonance
Orbital resonance is the phenomenon where the orbits of two or more celestial bodies periodically align. This resonance can lead to regular gravitational interactions between the celestial bodies, causing stability or changes in their orbits. Orbital resonance is particularly common between Jupiter's moons and Kuiper Belt objects.
The inner planets formed thanks to the orbital resonance of Jupiter and Saturn. How? Well, come on in: Our Family Solar System (All the Details)
Gravitational Force (Earth's Force)
Gravity is a fundamental physical force that creates an attractive force between all objects that have mass. Earth's gravity pulls objects on its surface towards its center, causing them to fall. This force shapes planetary orbits, tidal phenomena, and the large-scale structure of the universe.
This is for those who ask how such a force can exist: Your Defeated Head Against Gravity: What is Gravitational Force?
Magnetic Storms
Magnetic storms are temporary magnetic disturbances caused by the interaction of charged particles from the Sun with Earth's magnetic field. These storms can affect communication systems, navigation devices, and power grids. Magnetic storms also give rise to visual phenomena such as the aurora borealis.
Greenhouse Effect
The greenhouse effect is the process by which greenhouse gases (carbon dioxide, methane, water vapor, etc.) in the atmosphere trap heat from the sun, heating the planet's surface. Although this effect is a natural process, the increase in greenhouse gases due to human activities on Earth leads to global warming. The greenhouse effect is of great importance in terms of climate change and environmental problems.
These hot temperatures are driving us crazy, let's learn more about why we're burning up: Isn't it a Bit Too Hot? What is Greenhouse Effect?
Expansion of the Universe
The expansion of the universe is the process by which all galaxies in the universe have been moving further apart since the Big Bang. This phenomenon, discovered by Edwin Hubble, has been confirmed by observations of cosmological redshift.
Great Attractor
The Great Attractor is a large and mysterious gravitational center that influences the movements of celestial bodies in the local universe. Many galaxies, including the Milky Way, are being pulled toward the Great Attractor. The exact nature of the Great Attractor is still unknown, but it is thought to be a large galaxy cluster or supercluster.
