Universe Flashcards
What is an example and definition of a Galaxy?
Definition: A galaxy is a vast system of stars, gas, dust, and matter bound together by gravity.
Example: The Milky Way is the galaxy in which our solar system resides.
What is a star?
Stars are massive, luminous spheres held together by their own gravity and powered by nuclear fusion reactions in their cores.
What is an example and definition of a solar system?
A solar system is a collection of celestial bodies, including a central star (like the Sun), planets, moons, asteroids, comets, and other debris, all bound by gravity.
Example: Our solar system consists of the Sun, eight planets (including Earth), their moons, asteroids, comets, and other minor bodies.
Definition and role of nebulae in the star formation?
Definition: Nebulae are clouds of gas and dust in space. They serve as the birthplaces of new stars and planetary systems. forming protostars within them. ignite nuclear fusion and become full-fledged stars.
Importance of a Nebula?
Nebulae recycle material in the universe, enriching space with elements forged in stars. They also offer insights into stellar evolution and the birth and death of stars.
What is gravity?
Gravity happens between everything in the universe that has mass or energy. The more massive something is and the closer it is, the stronger the pull of gravity. This force is what keeps planets orbiting stars and holds everything together.
7 Lifestyle of a small stars?
Nebula Formation
Prostar Formation
Main Sequence Phase
Stable Period
Red Giant Phase
Helium Fusion
Planetary Nebula and White Dwarf
Lifestyle of large stars?
Nebula Formation
Prostar Formation
Main Sequence Phase
Red Supergiant Phase
Supernova
Neutron Star or Black Hole
Why are telescopes useful
They allow us to observe and study phenomena that would otherwise be beyond our reach. They continuously contribute to our expanding knowledge of the cosmos, from the tiniest particles to the largest structures.
What is the big bang theory?
The universe started very small and incredibly hot, around 13.8 billion years ago. All matter, energy, space, and time were concentrated in a single point called a singularity. Then, suddenly, there was an enormous explosion called the Big Bang, and everything began expanding outward.
What is cosmic radiation?
Is a faint and nearly uniform glow of microwave radiation that fills the entire universe. Imagine the universe at its very beginning, during the Big Bang. It was extremely hot and dense. As the universe expanded, it cooled down. When things cool down, they emit heat in the form of radiation.
What is the expanding universe theory?
The expanding universe theory is a fundamental concept that supports the Big Bang Theory. It’s the idea that galaxies are moving away from each other, and this motion suggests that the universe is expanding. Here’s a simple explanation:
Three advancements in scientific theories?
Geocentric Model
Heliocentric Model
Galileo’s Observations
Geocentric Model?
Geocentric Model:
In ancient Greece, philosophers like Aristotle proposed a geocentric model, where Earth was the center of the universe and other celestial bodies moved around it.
Heliocentric Model
In the 16th century, Nicolaus Copernicus proposed the heliocentric model, with the Sun at the centre and planets, including Earth, orbiting it.
