What are stars for grade 2?
Stars are huge, glowing balls of gases. The closest star to Earth is the Sun. Most of the pinpricks of light that shine in the night sky are also stars. Countless more stars are too far from Earth to be seen without a telescope.
What creates a star in space?
A star is born when atoms of light elements are squeezed under enough pressure for their nuclei to undergo fusion. All stars are the result of a balance of forces: the force of gravity compresses atoms in interstellar gas until the fusion reactions begin.
How do stars look in space?
To the naked eye, the stars look like tiny points of light . But stars are not tiny—they’re huge, burning balls of gas, like our Sun. They just appear small because they are so far away. The nearest star to our solar system is 4 light years away, which is 20 trillion miles.
What are stars in simple words?
A star is 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 in the observable universe, only a very small percentage are visible to the naked eye.
Where are stars in space?
Stars are not scattered randomly through space, they are gathered together into vast groups known as galaxies. The Sun belongs to a galaxy called the Milky Way. Astronomers estimate there are about 100 thousand million stars in the Milky Way alone. Outside that, there are millions upon millions of other galaxies also!
What is it called when a star is born in space?
Star Forming Nebula These knots contain sufficient mass that the gas and dust can begin to collapse from gravitational attraction. As it collapses, pressure from gravity causes the material at the center to heat up, creating a protostar. One day, this core becomes hot enough to ignite fusion and a star is born.
What are stars in very short?
A star is a very large ball of bright glowing hot matter in space. That matter is called plasma. Stars are held together by gravity. They give out heat and light because they are very hot.
Why do we need to study the stars?
Only the study of the Sun and other stars can help us to understand these processes in their entirety. In addition, mapping the movement of all the objects in our Solar System, allows us to predict the potential threats to our planet from space.
What are stars made of facts for kids?
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 is the best definition of a star?
Definition of star (Entry 1 of 3) 1a : a natural luminous body visible in the sky especially at night. b : a self-luminous gaseous spheroidal celestial body of great mass which produces energy by means of nuclear fusion reactions.
What color are stars in space?
Stars exist in a range of colors: red, orange, yellow, green, white and blue with red being the coolest and blue being the hottest. A star’s color indicates it’s temperature, composition and relative distance from earth.
Why do stars have color?
The color of a star is linked to its surface temperature. The hotter the star, the shorter the wavelength of light it will emit. The hottest ones are blue or blue-white, which are shorter wavelengths of light. Cooler ones are red or red-brown, which are longer wavelengths.
What is a star in astronomy?
Astronomy for Kids. Stars. A cluster of stars called the Pleiades. Source: NASA. What is a star? Stars are giant spheres of superhot gas made up mostly of hydrogenand 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 are the characteristics of the different types of stars?
The smallest stars are red and don’t give off much of a glow. Medium size stars are yellow, like the Sun. The largest stars are blue and are hugely bright. The larger the main sequence star, the hotter and brighter they are.
What are stars and how do they work?
Stars create their heat and light energy through explosions that burn hydrogen for fuel – kind of like how a car uses gasoline – turning it into helium through a method called nuclear fusion. And although they look like they twinkle when we see them from Earth, they really don’t.
What is the difference between main sequence stars and dwarf stars?
The larger the main sequence star, the hotter and brighter they are. Dwarfs – Smaller stars are called dwarf stars. Red and yellow stars are generally called dwarfs. A brown dwarf is one that never quite got large enough for nuclear fusion to occur.