what places a limit on the lifetime of a star? course hero

What is the life cycle of a star?

The life cycle of a star starts with birth, expansion due to change and growth, and eventually death. Compared to the life cycle of living organisms, the timespan of stars is completely different. Also, each star has its lifespan, depending on various factors. Stars are capable of lasting up to billions of years.

What is the lifespan of the biggest star?

Bigger stars fuse more hydrogen into helium, due to increased pressure & temperature in their cores. The biggest stars (red & blue super-giants) have lifespans in the 100s, down to 10s of millions of years, whereas a brown dwarf can burn for a trillion years or more.

How long does a T-Tauri star last?

The T-Tauri star lasts for about 100 million years, following which it enters the most extended phase of development – the Main sequence phase. 4. Main Sequence The main sequence phase is the stage in development where the core temperature reaches the point for the fusion to commence.

What are the 7 stages of the Star Cycle?

Seven Main Stages of a Star 1 Giant Gas Cloud. A star originates from a large cloud of gas. ... 2 Protostar. When the gas particles in the molecular cloud run into each other, heat energy is produced. ... 3 T-Tauri Phase. ... 4 Main Sequence. ... 5 Red Giant. ... 6 The Fusion of Heavier Elements. ... 7 Supernovae and Planetary Nebulae. ...

Why does a main sequence star have a certain lifetime?

A main sequence star has a certain lifetime, t, because of thermonuclear "burning" of the hydrogen in the core of the star. How is this lifetime on the main sequence related to the mass, M, of the star?

How many times brighter is a star than the Sun?

Measurements indicate that a certain star has a very high intrinsic brightness/or luminosity (100,000 times as bright as our Sun) and yet it is relatively cool. How can this be?

What is the magnitude of the North Star?

The star Phoenecis has an apparent magnitude of 3.4 and an absolute magnitude of -4.6. The North Star (Polaris) has an apparent magnitude of 2 and an absolute magnitude of -4.6. Assuming that no light has been absorbed or scattered by interstellar dust, we can say for sure that

What is the spectral class of Hadar?

The star Hadar has a spectral class of B1 III. This tells us that Hadar is a

How many intervals are there in the spectral sequence of stars?

In the spectral sequence of star types, each category has been divided into ten intervals. The Sun is classified as a

Why do stars appear to be fainter than expected?

Star clusters of the same type and structure appear to become fainter than expected, on the basis of the inverse square law alone, as distance from the Sun increases. This is because

Where does the star move in the process of helium shell fusion?

In the process of helium shell fusion in low-mass stars near the end of their lives, the star moves upward and to the right on the asymptotic giant branch of the HR diagram. In this process, the star is

How long do stars last?

The single biggest factor in determining the lifespan of a star is its size. Bigger stars fuse more hydrogen into helium, due to increased pressure & temperature in their cores. The biggest stars (red & blue super-giants) have lifespans in the 100s, down to 10s of millions of years, whereas a brown dwarf can burn for a trillion years or more. Our Sun has burned for 4.5 billion years, & will burn for another 4.5 billion or so. In the past, scientists tried to figure out how long the Sun would burn if it were made of the only thing they could comprehend: coal! Needless to say, the answer they go

How long does a massive star live?

The size; A massive star might only live a few million years. It uses fuel like a drunken sailor spends money on a two day pass.

How to determine if a person has a long or short life?

Whether a person is to have long, medium, or short life can be determined by taking the following facts and their relationships in terms of the movable, fixed and common signs; (Rasis) the lords of the Ascendant and the Moon-Chart, and the lord of the Ascendant as also the lord of the 8th house; similarly by taking the pairs of the drekkaana and dwadasaamsa of the Ascendant and their relationships. If the Ascendant (Lagna) and the Moon are movable, the native will have long life.Ascendant and the Moon Raasis are movable signs and the lords of the Ascendant and the Moon are movable the native will have Long Life.

What happens to the native if the ascendant is movable?

9. If the Ascendant is movable and the lords of Ascendant and the 8th house are fixed, the native will have Medium life.

What happens if the Ascendant and Moon are movable?

3. If the Ascendant and Moon are movable and their lords are common the native will have Short life.

How to determine if a person is long, medium, or short?

Whether a person is to have long, medium, or short life can be determined by taking the following facts and their relationships in terms of the movable, fixed and common signs; (Rasis) the lords of the Ascendant and the Moon-Chart, and the lord of the Ascendant as also the lord of the 8th house; similarly by taking the pairs of the drekkaana and dwadasaamsa of the Ascendant and their relationships. If the Ascendant (Lagna) and the Moon are movable, the native will have long life.Ascendant and the Moon Raasis are movable signs and the lords

What happens if the Ascendant and the Moon are common and their lords are fixed?

6 If the Ascendant and the Moon are common and their lords are fixed, the native will have Long life.

How does the life cycle of a star work?

Life Cycle Of A Star. Stars go through a natural cycle, much like any living beings. This cycle begins with birth, expands through a lifespan characterized by change and growth, and ultimately leads to death. The time frame in the life cycle of stars is entirely different from the life cycle of a living being, lasting in the order of billions ...

How does a star expand?

Without the reactions occurring at the core, a star contracts inward through gravity causing it to expand.

What is the T-Tauri phase?

T-Tauri Phase. A T-Tauri star begins when materials stop falling into the Protostar and release tremendous amounts of energy. The mean temperature of the Tauri star isn’t enough to support nuclear fusion at its core.

How do you see protostars?

This results in the formation of a warm clump of molecules referred to as the Protostar. The creation of Protostars can be seen through infrared vision as the Protostars are warmer than other materials in the molecular cloud.

What determines how a star will shine?

Stars come in a variety of masses and the mass determines how radiantly the star will shine and how it dies. Massive stars transform into supernovae, neutron stars and black holes while average stars like the sun, end life as a white dwarf surrounded by a disappearing planetary nebula. All stars, irrespective of their size, ...

How long do red dwarf stars burn?

These red dwarves are difficult to spot. But, these may be the most common stars that can burn for trillions of years. The above were the seven main stages of the life cycle of a star. Whether big or small, young or old, stars are one of the most beautiful and lyrical objects in all of creation.

What is the main sequence phase?

The main sequence phase is the stage in development where the core temperature reaches the point for the fusion to commence. In this process, the protons of hydrogen are converted into atoms of helium. This reaction is exothermic; it gives off more heat than it requires and so the core of a main-sequence star releases a tremendous amount of energy.