The Sun will spend a total of approximately 10 billion years as a main-sequence star.

Right now, our Sun is a main-sequence star, not a red giant.

It may stay a main-sequence star, looking about the same, for billions of years.

These represent the final evolutionary stage of many main-sequence stars.

It is a main-sequence star with a stellar classification of G8.

Astrophysicists say our Sun is a main-sequence star in the middle of its life.

It is a yellow main-sequence star of spectral type G3.

At this point the Sun became a main-sequence star.

The primary is a main-sequence star of type B5.

Surface activity appears to be related to the age and rotation rate of main-sequence stars.

You can see an example of the band of main-sequence stars to the right.

A hot, luminous main-sequence star may also be referred to as a giant.

It is near the end of its life as a main-sequence star that fuses hydrogen.

All main-sequence stars have a core region where energy is generated by nuclear fusion.

This relationship applies to main-sequence stars in the range 0.1-50 solar masses.

On average, main-sequence stars are known to follow an empirical mass-luminosity relationship.

Of course most people have never seen an M-class main-sequence star, certainly not bright enough to notice color.

This makes it shine very brightly and become what astronomers think of as a main-sequence star.

Methane absorption is not expected at the temperatures of main-sequence stars.

In a normal star, like our Sun and all other main-sequence stars, this change happens at the very center of the star.

"The only thing that looks bright enough to be a nearby main-sequence star is that one there."

"Which is most unusual, because main-sequence stars typically expand and cool for billions of years before such an event."

The star system is composed of two K- type main-sequence stars:

The Sun has steadily increased in luminosity over the course of its life, increasing by 40% since it first became a main-sequence star.

With an age of roughly 6 billion years, it is slightly older than the Sun, but is still a main-sequence star.

The main sequence stars in our spiral have been changing.

The components are main sequence stars of similar size and appearance.

For example, the Sun is a main sequence star.

They were well away from the local sun, which was a small yellow-orange main sequence star.

The behaviour of a post main sequence star depends largely on its mass.

Their hottest main sequence stars are of spectral type B0.

The primary component is a white A-type main sequence star.

The secondary companion in this system may be a main sequence star with a stellar class of B2.

It was the first long-period planet around a main sequence star to be discovered.

Such stars spend most of their energy-producing life span as a main sequence star.

And there appear to be a lot of them, as these planets seem to be more common than main sequence stars.

It is a main sequence star, like our Sun, but dimmer and slightly hotter.

The companion may be a main sequence star, or one that is aging and expanding into a red giant.

The Sun remains a main sequence star today.

A yellow-white main sequence star, it has a white dwarf companion.

When the Sun first became a main sequence star, it radiated only 70% of the current luminosity.

It is a main sequence star with a stellar classification of K3V.

Why don't main sequence stars stop fusion if the expansion is happening with in their cores?

It is now a main sequence star and will remains so until it burns through all its fuel.

The secondary is likely an F-type main sequence star with an apparent magnitude of +7.77.

The latter is a K-type main sequence star with a visual magnitude of 9.5.

Previously it was an A-type main sequence star before using up the hydrogen at its core.

This is curious, because most main sequence stars with planets tend to have a higher abundance of metals.

Like the other stars in the group, it is a main sequence star not unlike our Sun, although somewhat hotter, brighter and larger.

Gliese 638 is a main sequence star in the constellation of Hercules.