طبعة جديدة من٪ LB.S10.2.A الطريق إلى النجوم by israa hisham https://padlet.com/israah5520/yf0a46gxqdtfqy4e اسراء en-us 2022-04-28 11:49:30 UTC 2022-05-13 14:42:28 UTC hello@padlet.com https://padlet.net/icons/png/1f31f.png israah5520 https://padlet.com/israah5520/yf0a46gxqdtfqy4e/wish/2162011885 2022-04-28 11:49:30 UTC https://padlet.com/israah5520/yf0a46gxqdtfqy4e/wish/2162011885 الطالبه: "حنين غزاوي",الصف:عاشر"ب" https://padlet.com/israah5520/yf0a46gxqdtfqy4e/wish/2165260731
The stars are huge celestial bodies, extremely hot, flaming, and luminous in themselves
Very wide distances separate us from the stars
Stars differ from each other in shape, size, color, and degree of luminosity
Look! These night stars have appeared
I looked up at the sky and saw a large number of star
I will not go to watch the stars tonight
 loved watching stars at night
They scintillate like stars in the night
A lot of stars appeared tonight
I like watching the sparkling stars

The sky is filled with stars today.




]]> 2022-04-30 13:27:20 UTC https://padlet.com/israah5520/yf0a46gxqdtfqy4e/wish/2165260731 Ghazal suwais https://padlet.com/israah5520/yf0a46gxqdtfqy4e/wish/2173768125 10C


Stars

Stars are the most widely recognized astronomical objects, and represent the most fundamental building blocks of galaxies. The age, distribution, and composition of the stars in a galaxy trace the history, dynamics, and evolution of that galaxy. Moreover, stars are responsible for the manufacture and distribution of heavy elements such as carbon, nitrogen, and oxygen, and their characteristics are intimately tied to the characteristics of the planetary systems that may coalesce about them. Consequently, the study of the birth, life, and death of stars is central to the field of astronomy.

]]> 2022-05-07 10:23:46 UTC https://padlet.com/israah5520/yf0a46gxqdtfqy4e/wish/2173768125 Life Cycle of a StarAll stars form in nebulae, which are huge clouds of gas and dust. Though they shine for many thousands, and even millions of years, stars do not last for ever. The changes that occur in a star over time and the final stage of its life depend on a star's size. Nuclear reactions at the centre (or core) of a star provides energy which makes it shine brightly. This stage is called the 'main sequence'. The exact lifetime of a star depends very much on its size. Very massive stars use up their fuel quickly. This means they may only last a few hundred thousand years. Smaller stars use up fuel more slowly so will shine for several billion years. Eventually, the hydrogen which powers the nuclear reactions inside a star begins to run out. The star then enters the final phases of its lifetime. All stars will expand, cool and change colour to become a red giant. What happens next depends on how massive the star is. A smaller star, like the Sun, will gradually cool down and stop glowing. During these changes it will go through the planetary nebula phase, and white dwarf phase. After many thousands of millions of years it will stop glowing and become a black dwarf. A massive star experiences a much more energetic and violent end. It explodes as a supernova. This scatters materials from inside the star across space. This material can collect in nebulae and form the next generation of stars. After the dust clears, a very dense neutron star is left behind. These spin rapidly and can give off streams of radiation, known as pulsars. If the star is especially massive, when it explodes it forms a black hole. https://padlet.com/israah5520/yf0a46gxqdtfqy4e/wish/2173786523 Sara abudhies
C 10]]> 2022-05-07 11:12:53 UTC https://padlet.com/israah5520/yf0a46gxqdtfqy4e/wish/2173786523