Sun

What is the exact density of the Sun? It is made of hydrogen and helium, two of the lightest elements known. Does it mean it’s not very dense? What factors affect stellar density and how do we compute the Sun’s density? Does gravity have any effect at all? These are just some of the questions […]

How does the fusion in the Sun work? The Sun is very hot. In fact, it is so hot that it provides enough warmth and light to our planet. How did it become hot in the first place? The Sun is made up of light gasses, specifically hydrogen. What happens to hydrogen inside its core

What color is the Sun when looked at from Earth and from outer space? Everybody knows that the Sun is a very hot star. It gives out light and electromagnetic waves. These waves have colours ranging from violet to red. The colour yellow is what most people associate the Sun with. But is that the

Radiation is a form of energy transmitted in rays, particles, or waves. Almost all energy that the Earth uses for its consumption comes from the Sun. This energy travels through space by radiation. Solar radiation, therefore, is the energy, specially electromagnetic energy, that the Sun gives off. The Sun produces energy through nuclear fusion at

Stars give out varying degrees of brightness. Larger stars generally are much more luminous than smaller ones. To measure the brightness or luminosity (also called as radiant power) of a star, astronomers use the Sun’s own level of luminosity as their point of comparison. One solar luminosity unit, therefore, is equal to about 3.839×1026 W,

The Sun is the Earth’s main source of energy. Since the beginning of time, it has been steadily delivering its energy to every inch of the surface of the Earth. The thing that keeps the Sun from using up all of its energy and power is nuclear fusion, where nuclei combine to form much larger

The declination of the Sun is the measurement of the angle between the Sun’s rays and the Earth’s equatorial plane. This principle is used to explain why we have different seasons, why there are four in some countries and there are only two in some. The Earth’s axis is tilted by 23.5 degrees away from

The Sun produces various forms of energy that sustains life on earth. Without the energy provided by the Sun, most life forms known on earth will cease to exist. It will drastically change established life cycles and food chains and will start a new evolution process. Like most stars, the Sun is composed mainly of

Although the Sun is about 93 million miles away from Earth, the various complex processes and activities that it undergoes can still affect the Earth and engage scientists. During the Sun’s eleven year cycle, scientists found that there is a constant period of activity that occurs roughly in the same intervals. Changes in the activity