The Sun is located at the center of our solar system, and Earth orbits 93 million miles away from it. Though massive, the Sun still isn’t as large as other types of stars. It’s classified as a yellow dwarf star.
- How far away are the planets from the sun in CM?
- What is the mean distance of Mercury from the Sun?
- What is the closest planet to Sun?
- Why is Sun called yellow dwarf?
- Is Sun a yellow dwarf?
- Are dwarf stars hotter than the sun?
- Which star has the shortest lifespan?
- Which star has the longest lifespan?
- Why do most stars not necessarily die?
- What is the most important force in astronomy?
- What do they call the blue stars found?
- What is a star constantly fighting with?
- What two forces act on a star?
- What happens as a star ages and leaves the main sequence?
How far away are the planets from the sun in CM?
|planet||distance from Sun relative|
What is the mean distance of Mercury from the Sun?
From an average distance of 36 million miles (58 million kilometers), Mercury is 0.4 astronomical units away from the Sun. One astronomical unit (abbreviated as AU), is the distance from the Sun to Earth. From this distance, it takes sunlight 3.2 minutes to travel from the Sun to Mercury.
What is the closest planet to Sun?
Why is Sun called yellow dwarf?
According to their system of classification, the Sun is known as a yellow dwarf star. So the Sun is at the higher end of this group. The official designation is as a G V star. Stars in the this classification have a surface temperature between 5,300 and 6,000 K, and fuse hydrogen into helium to generate their light.
Red dwarf stars
Is Sun a yellow dwarf?
Are dwarf stars hotter than the sun?
The Answer The hot core, about the size of the Earth but much denser, becomes exposed: this is the white dwarf. When a star has just become a white dwarf, it is hotter than 100,000 K (about 180,000 F). It then gradually cools — after many billions of years, it can become cooler than the Sun (which is about 6,000 K).
Which star has the shortest lifespan?
Which star has the longest lifespan?
The stars with the longest lifetimes are red dwarfs; some may be nearly as old as the universe itself.
- Red Dwarf Stars. Astronomers define a red dwarf as a star having between about 0.08 and 0.5 times the mass of the sun and formed primarily of hydrogen gas.
- Luminosity and Lifetime.
- Nuclear Fusion.
- Life Cycle of Stars.
Why do most stars not necessarily die?
Why do most stars not necessarily die in the time we would normally expect them to? The result of collisions between two smaller, older stars.
What is the most important force in astronomy?
Gravity is one of the fundamental forces in the Universe. Although gravity is the weakest of all the forces in the Universe, it is the most important force in the study of astronomy. Originaly defined by Newton, and refined by Einstein, gravity is essentially the natural force of attraction between any two objects.
What do they call the blue stars found?
Blue supergiants are supergiant stars (class I) of spectral type O. They are extremely hot and bright, with surface temperatures of between 20,000 – 50,000 degrees Celsius. The best known example is Rigel, the brightest star in the constellation of Orion.
What is a star constantly fighting with?
A star’s life is a constant struggle against the force of gravity. Gravity constantly works to try and cause the star to collapse. The star’s core, however is very hot which creates pressure within the gas. This pressure counteracts the force of gravity, putting the star into what is called hydrostatic equilibrium.
What two forces act on a star?
Gravitational forces act to contract the star. Fusion reactions and heat convection act to expand the star. The two forces are balanced and the star remains stable in size and reactions.
What happens as a star ages and leaves the main sequence?
When the stars go out. Eventually, a main sequence star burns through the hydrogen in its core, reaching the end of its life cycle. At this point, it leaves the main sequence. Then the pressure of fusion provides an outward thrust that expands the star several times larger than its original size, forming a red giant.
What makes a planet a planet? And what makes a star a star? Once we know this these defining characteristics, we start to notice that these definitions can o…