star,
any massive self-luminous celestial body of gas that shines by radiation derived from its internal energy sources
. Of the tens of billions of trillions of stars composing the observable universe, only a very small percentage are visible to the naked eye.
What is the star short answer?
A star is
a luminous ball of gas
, mostly hydrogen and helium, held together by its own gravity. Nuclear fusion reactions in its core support the star against gravity and produce photons and heat, as well as small amounts of heavier elements. The Sun is the closest star to Earth.
What is a star for kids?
What is a star? Stars are giant spheres of superhot gas made up mostly of hydrogen and helium. Stars get so hot by burning hydrogen into helium in a process called nuclear fusion. This is what makes them so hot and bright. Our Sun is a star.
What 3 things define a star?
Stars can vary greatly in age, size, luminosity, and color. It is estimated that there are 100 billion galaxies in the universe, each possibly containing 100 billion stars.
A star is a celestial sphere of gas held together by its own gravity.
How is a star made simple explanation?
Stars are born within the clouds of dust and scattered throughout most galaxies
. … Turbulence deep within these clouds gives rise to knots with sufficient mass that the gas and dust can begin to collapse under its own gravitational attraction. As the cloud collapses, the material at the center begins to heat up.
What is star give example?
Star is defined as a bright point of light in the sky or a five-sided drawing that is meant to resemble the points of light in the sky. An example of star is
what makes up the Big Dipper constellation
. An example of star is a drawing of a five-sided point of light.
Do stars twinkle?
As light from a star races through our atmosphere, it bounces and bumps through the different layers, bending the light before you see it. Since the hot and cold layers of air keep moving, the
bending of the light changes
too, which causes the star’s appearance to wobble or twinkle.
What is a star in one sentence?
star (n):
a small point of light in the night sky
; a person in the leading role of a movie or show; someone who has great skills in an activity. Listen to all | All sentences (with pause) Used with adjectives: “We saw countless bright stars tonight.” (bright, brilliant, beautiful)
What are the 7 types of stars?
There are seven main types of stars. In order of decreasing temperature,
O, B, A, F, G, K, and M
.
What is the full form of star?
The acronym STAR stands for:
Situation
.
Task/ Target
.
Action
.
Result
.
What is the biggest star?
The cosmos is full of objects that defy expectations. Although it’s difficult to pin down the exact traits of any given star, based on what we know, the largest star is
UY Scuti
, which is some 1,700 times as wide as the Sun.
What is the most common type of star?
Red Dwarf Stars
The resulting dull red stars are actually the most common type in our galaxy but since they’re quite dim, they’re hard to see. The nearest red dwarfs are probably Proxima Centauri and Barnard’s Star, but both of these are too faint to see with the unaided eye.
Which star is the hottest?
The hottest one measures ~210,000 K; the hottest known star.
The Wolf-Rayet star WR 102
is the hottest star known, at 210,000 K.
How are star made?
Stars
form from an accumulation of gas and dust, which collapses due to gravity and starts to form stars
. The process of star formation takes around a million years from the time the initial gas cloud starts to collapse until the star is created and shines like the Sun. … Without this dust and gas, stars would not form.
How long does a star live for?
Generally, the more massive the star, the faster it burns up its fuel supply, and the shorter its life. The most massive stars can burn out and explode in a supernova after only a few million years of fusion. A star with a mass like the Sun, on the other hand, can continue fusing hydrogen for
about 10 billion years
.
How does a star work?
They all work by the same basic principle:
they fuse atoms in their cores to make heat and light
. It’s how a star works. … That process of fusion releases heat and light. This process is called “stellar nucleosynthesis”, and is the source of many of the elements in the universe heavier than hydrogen and helium.
