A planetary nebula is created when a star blows off its outer layers after it has run out of fuel to burn. These outer layers of gas expand into space, forming a nebula which is often the shape of a ring or bubble.

What causes a planetary nebula quizlet?

A planetary nebula is formed when a red giant ejects its outer atmosphere. The beautiful images show that a planetary nebula is a stage in the evolution of a low mass star. They last tens of thousands of years. A white dwarf is the carbon core of a red giant that has ejected its photosphere as a planetary nebula.

What stars produce planetary nebula?

Smaller stars like our sun end their lives by ejecting their outer layers of gas into space over the course of about 10,000 years, leaving behind the star’s hot core — a white dwarf. Radiation from the white dwarf causes the gas to glow, creating a unique and beautiful formation called a planetary nebula.

What causes the nebula?

The Short Answer: A nebula is a giant cloud of dust and gas in space. Some nebulae (more than one nebula) come from the gas and dust thrown out by the explosion of a dying star, such as a supernova. Other nebulae are regions where new stars are beginning to form.

What exactly is a planetary nebula?

planetary nebula, any of a class of bright nebulae that are expanding shells of luminous gas expelled by dying stars.

How can a planetary nebula be identified?

Center for Astrophysics | Harvard & Smithsonian scientists study planetary nebulas in several different ways: Identifying the atoms and molecules within planetary nebulas, mostly through the infrared light they emit and absorb. Infrared light can pierce through clouds of gas and dust, which are opaque to visible light.

What is a planetary nebula quizlet?

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!

What triggers the birth of a star?

A star is born when atoms of light elements are squeezed under enough pressure for their nuclei to undergo fusion. … And once the fusion reactions begin, they exert an outward pressure. As long as the inward force of gravity and the outward force generated by the fusion reactions are equal, the star remains stable.

What causes dark nebula?

What causes a dark nebula? They are caused by interstellar clouds with a very high concentration of dust grains obscuring light. These dust clouds obscure and block visible light objects behind it. Such as background stars or emission or reflection nebulae.

How are emission nebulae formed?

An emission nebula is created by ionised gases, usually by high-energy ultraviolet photons emitted from a nearby hot star, that emit light of various wavelengths.

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How are planets formed?

The Sun and the planets formed together, 4.6 billion years ago, from a cloud of gas and dust called the solar nebula. A shock wave from a nearby supernova explosion probably initiated the collapse of the solar nebula. The Sun formed in the center, and the planets formed in a thin disk orbiting around it.

Where are planetary nebulae found?

About 3000 planetary nebulae are now known to exist in our galaxy, out of 200 billion stars. Their very short lifetime compared to total stellar lifetime accounts for their rarity. They are found mostly near the plane of the Milky Way, with the greatest concentration near the galactic center.

What is the difference between nebula and planetary nebula?

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.

What type of object is found in the center of a planetary nebula?

A planetary nebula is an astronomical object consisting of a glowing shell of gas and plasma formed by certain types of stars at the end of their lives. They are in fact unrelated to planets; the name originates from a supposed similarity in appearance to giant planets.

What happens during planetary nebula ejection?

When a star like the Sun nears the end of its life, it expands to more than 50 times its original diameter, becoming a red giant star. Then its outer layers are ejected into space, exposing the small, extremely hot core of the star, which cools off to become a white dwarf.

What is a planetary nebula quizlet a disk of gas?

Terms in this set (23) A planetary nebula is a(n) a. disk-shaped nebula of dust and gas around a relatively young star, from which planets will eventually form.

What causes the radio pulses of a pulsar?

What causes the radio pulses of a pulsar? A black hole near the neutron star absorbs energy and re-emits it as radio waves. As the neutron star spins, beams of radio radiation sweep through space. If one of the beams crosses the Earth, we observe a pulse.

Why does the presence of iron trigger a supernova?

Why is iron significant to understanding how a supernova occurs? -Supernovae often leave behind neutron stars, which are made mostly of iron. -Iron is the heaviest of all atomic nuclei, and thus no heavier elements can be made. –The fusion of iron into uranium is the reaction that drives a supernova explosion.

How are planetary nebulae comparable to a fluorescent light bulb?

How are planetary nebulae comparable to a fluorescent light bulb in your classroom? Illumination for both is due to the glow produced when ultraviolet light (from the dying star in the nebula and from mercury vapor inside a fluorescent tube) ionizes various gases and causes them to glow with visible light.

Can life exist in a nebula?

Possibly, but probably not. It is not known when life formed on Earth, but Earth was once part of a nebula, and it now has life. Most likely life got started on Earth after the solar nebula was essentially gone, but that is not known with certainty.

Why do planetary nebulae look different?

We know that a planetary nebula is actually layers of gas ejected from a red giant star’s outer atmosphere and lit up by the star’s radiation. The different colours are from different chemical elements in the gas.

Why are emission nebulae hot?

Most emission nebulae are the sites of recent star formation, where hot, energetic radiation streaming from the newborn stars sculpts a nebula’s bright and dark clouds into intriguing (and sometimes mystifying) shapes.

What is the power source of the typical emission nebula?

An emission nebula is a nebula formed of ionized gases that emit light of various wavelengths. The most common source of ionization is high-energy ultraviolet photons emitted from a nearby hot star.

Are stars born in dark nebula?

Dark nebulas, or dark clouds in space are intriguing because they appear to be “holes” in the sky where there aren’t any stars. … The cloud contains huge amounts of cool cosmic dust and is a nursery where new stars are being born.

Are black holes created by a nebula?

Gravity is a powerful force: it keeps the planets revolving in their orbits around the sun, and it was even responsible for forming the planets, as well as the sun, from nebulae. … If a star is large enough — which is determined when it forms — gravity can turn it into a black hole.

What will happen if the sun dies?

After the Sun exhausts the hydrogen in its core, it will balloon into a red giant, consuming Venus and Mercury. Earth will become a scorched, lifeless rock — stripped of its atmosphere, its oceans boiled off. … While the Sun won’t become a red giant for another 5 billion years, a lot can happen in that time.

What will happen to the solar system when the sun dies?

In five billion years, the sun is expected to expand, becoming what is known as a red giant. “In this process of the sun becoming a red giant, it’s likely going to obliterate the inner planets … … Once the sun completely runs out fuel, it will contract into a cold corpse of a star – a white dwarf.

How do nebulae produce light?

Emission nebulae are clouds of ionised gas that, as the name suggests, emit their own light at optical wavelengths. As the neutral hydrogen atom returns to its lowest energy state, it emits photons at wavelengths equivalent to the energy differences between the allowed energy states of hydrogen. …

What kind of object creates an evacuated very hot bubble in the interstellar gas?

The “bubble” is created by the stellar wind from a massive hot, 8.7 magnitude young central star (the 15 ± 5 M SAO 20575). The nebula is near a giant molecular cloud which contains the expansion of the bubble nebula while itself being excited by the hot central star, causing it to glow.

What is a supernova remnant composed of?

A supernova remnant (SNR) is the structure resulting from the explosion of a star in a supernova. The supernova remnant is bounded by an expanding shock wave, and consists of ejected material expanding from the explosion, and the interstellar material it sweeps up and shocks along the way.

What causes a solar nebula to initially form a solar system?

Scientists believe that the solar system was formed when a cloud of gas and dust in space was disturbed, maybe by the explosion of a nearby star (called a supernova). … Squeezing made the cloud start to collapse, as gravity pulled the gas and dust together, forming a solar nebula.