When a star like our Sun dies, it doesn't explode into a supernova or collapse into a black hole. Instead, it gently sheds its outer layers, which form a beautiful cloud called a “planetary nebula”, while the dying star's core becomes a white dwarf.
A planetary nebula is the ejected shell of an evolved giant star. It is the shape of a spherical shell and is composed of relatively cool thing gas, which was once the outer part of the star. A planetary nebula is associated with the death of a low mass star. You just studied 15 terms!
Planetary nebulae are important objects in astronomy because they play a crucial role in the chemical evolution of the galaxy, returning material to the interstellar medium which has been enriched in heavy elements and other products of nucleosynthesis (such as carbon, nitrogen, oxygen and calcium).
A planetary nebula is born when a low-mass star (less than around eight times the mass of the Sun) dies, while a supernova is the result of the death of a massive star.
The planet Earth is not part of any particularly named Nebula . Earth is part of the Solar System which is part of our home galaxy, the so-called "Milky Way", which is part of the so-called Local Group , a collection of more than 50 other galaxies in the "neighborhood" of our own galaxy.
A: A nebula refers to clouds of dust and gas that lie between stars, in so-called interstellar space. A planetary nebula is a special type of nebula made when the outer layers of an old, giant star are thrown off into space.
A nebula is a cloud of dust and gas, usually tens to hundreds of light years across. A galaxy is much larger — usually thousands to hundreds of thousands of light years across. Nebulae are one of the many things that galaxies are made of, along with stars, black holes, cosmic dust, dark matter and much more.
Can a habitable world exist that would orbit in and out of a nebula? The answer would be yes. As the planet orbits its star that orbits the center of the galaxy, the planet and its star could enter a nebula and pass through that nebula for thousands or millions of years and then emerge on the other side of the nebula.
Not only may scientists someday find life without a home planet, but the life on our world may owe its origins to the depths of interstellar space itself.
In about 5 billion years, when the sun shucks off its outer layers, it will create a beautiful shell of diffuse gas known as a planetary nebula.
Our solar system formed about 4.5 billion years ago from a dense cloud of interstellar gas and dust. The cloud collapsed, possibly due to the shockwave of a nearby exploding star, called a supernova. When this dust cloud collapsed, it formed a solar nebula – a spinning, swirling disk of material.
As the protoplanets grew to become planets, parts of them melted due to radioactivity, gravitational influences, and collisions. Where the objects had melted, the composition of the planets changed. Heavier elements sank, forming the cores of the planets, and lighter objects rose to the surface.
Vocabulary. These are terms students may encounter while doing further research on the planets in the solar system: Jovian planets: The outer planets of our solar system: Jupiter, Saturn, Uranus, and Neptune.
Uranus is the seventh planet from the Sun, and has the third-largest diameter in our solar system. It was the first planet found with the aid of a telescope, Uranus was discovered in 1781 by astronomer William Herschel, although he originally thought it was either a comet or a star.
The main difference between Terrestrial Planets and Jovian Planets is that Terrestrial Planets have a solid and rocky surface, with a dense metallic core. Jovian Planets have a large gaseous composition and a small, molten rock core.
Rings. Saturn's rings are thought to be pieces of comets, asteroids, or shattered moons that broke up before they reached the planet, torn apart by Saturn's powerful gravity. They are made of billions of small chunks of ice and rock coated with other materials such as dust.
The outermost ring is made up of ice boulders several feet across. The other rings are made up mainly of icy chunks darkened by rocks. The rings are thin, narrow, and dark compared to the rings of other planets. They are actually so dark that they reflect about as much light as charcoal.
About 10 million tons of diamond rain down on Saturn each year. The new molecule is relatively heavy, and when attracted by the planet's gravity, begins to be drawn downwards.
Structure. The composition of Jupiter is similar to that of the Sun – mostly hydrogen and helium. Deep in the atmosphere, pressure and temperature increase, compressing the hydrogen gas into a liquid. This gives Jupiter the largest ocean in the solar system – an ocean made of hydrogen instead of water.