what is a river and its tributaries
What Is A River And Its Tributaries? A tributary is a f...
Speeding outward from the Earth and moon system, you pass the orbits of the planets Mars, Jupiter and Saturn. From all of these worlds, Earth looks like a star, which gets fainter as you get farther away.
Why do stars look much smaller than the sun?
However, compared to other stars, our Sun is only a medium-sized star, meaning that some stars are much larger than the Sun and some are much smaller. The Sun looks bigger than other stars because it is so much closer to the Earth. The further away an object is, the smaller it appears, even if it is very big.
Why do all stars contain helium?
Hydrogen and helium are found in all stars. Ninety percent of all atoms in the universe are hydrogen atoms and fusion reactions fuel stars, resulting in the formation of helium and higher atomic number elements. This is the case because of the Big Bang, when temperatures were so high that only energy could exist.
How is nitrogen formed in stars?
The conditions needed for the production of primary nitrogen are very simple. In a star which has both a helium burning core and a hydrogen burning shell, some amount of the new carbon synthesized in the core must be transported into the hydrogen burning shell, where the CNO cycle will convert it into primary 14N.
What elements are created in stars?
Stars create new elements in their cores by squeezing elements together in a process called nuclear fusion. First, stars fuse hydrogen atoms into helium. Helium atoms then fuse to create beryllium, and so on, until fusion in the star’s core has created every element up to iron.
What is the hottest planet?
Venus
Planetary surface temperatures tend to get colder the farther a planet is from the Sun. Venus is the exception, as its proximity to the Sun and dense atmosphere make it our solar system’s hottest planet.Jan 30, 2018
Which planet we can see from Earth with naked eyes?
Only five planets are visible from Earth to the naked-eye; Mercury, Venus, Mars, Jupiter and Saturn. The other two— Neptune and Uranus—require a small telescope.
Why Do Stars Shine? | Astronomic
Why do Stars Shine? | Educational Videos For Kids
Stars 101 | National Geographic
Why Do Stars Twinkle?
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