Main Sequence College Essays Samples For Students

(Check the 7_Main_Sequence)
- What is a main sequence star?

Answer: Stars that combines hydrogen into helium in their cores are called main sequence stars

- What are the different types of main sequence stars and what distinguishes them (size, colour, lifetime, luminosity)?
Answer: The Upper main sequence stars (Stars above 1.5 the mass of the sun) and the Lower main sequence stars (Stars below 1.5 the mass of the sun). The distinguishing features of these types of stars are mass, temperature, brightness and elemental composition.
- What is an HR Diagram and what does it reveal to astronomers?
Answer: HR Diagram is a scatter graph showing the relationship between a star ...

Einar Hertzsprung and Henry Rusell, independently, studied how the brightness and temperatures of stars relate, and developed the Hertzsprung-Russell diagram. The H-R diagrams are studied to understand how stars relate in terms of size, color and temperature.
Before producing an H-R diagram, a portion of the sky is surveyed by astronomers and each star plotted according to its brightness and temperature. Ordinary stars, also called main-sequence stars, fall within the band from the upper-left portion to the lower-left portion of the H-R diagram. They constitute about 90% of the H-R diagram stars. The intrinsically brightest main sequence stars are ...

Blue supergiant stars are staller evolutions that have resulted over millions of years. Stars during the main sequence phase spend a majority of their lives. During the main sequence stage, the star converts hydrogen to helium by nuclear fusion in the cores of stars the process also known as proton-proton chain. After spending of hydrogen fuel, the star will collapse and heat up rapidly causing the outer layers to expand inwards. When the core is very hot, the energy spreads through the interior of the star’s large surface area. The different fusion rates of different elements vary wildly to ...

Introduction

The very title of this article may seem to some readers fantastic. Is there any evidence that alien beings exist? Can we prove that there is no clear scientific argument in favor of their life and activity? Such questions immediately arise among readers, of course, they are quite natural. And yet, I will try to show that the statement of the problem in our time of exclusively rapid scientific and technical progress is quite logic. Moreover, most recently the first steps towards the solution of this great problem facing mankind were taken. Basically, from the scientific point of view ...

Gravitational, electromagnetic, strong and weak nuclear forces. Gravitational force is an attraction between any two pieces of matter in the universe. Electromagnetic force is present in pieces of matter, which are able to carry electrical charge. Strong force is holding the nuclei of atoms together. Weak force is responsible for radioactive decay.
Molecules are built from the atoms and atoms consist of protons, neutrons and electrons. Protons and neutrons are built of smaller particles called quarks.
Electromagnetic spectrum is the range of all the light in the universe. Depending on the wavelength and frequency there are radio, micro, infrared, ...

Stellar evolution refers to the processes and radical changes undergone by a star during its lifespan. It is the process through which pressure and forces of gravity change or alter a star. Depending on its mass, the lifespan of a star can take several million years or trillions of years.
Stars undergo several stages during their lifetime, with the first stage being Giant Molecular Cloud. During the Giant Molecular cloud, a star begins its life at this stage where it is a large, dust- filled cloud of gas which is very cold. Fragments of solar masses start collapsing due to a number of reasons, ...