What caused the Local Bubble?
The local hot bubble is a cavity in the interstellar medium filled with hot, X-ray-emitting gas. Astronomers suspect that a nearby supernova explosion carved the bubble out hundreds of thousands or millions of years ago, leaving a region filled with relatively little neutral hydrogen but a lot of million-degree gas.
What is a Local Bubble in space?
The Local Bubble, or Local Cavity, is a relative cavity in the interstellar medium (ISM) of the Orion Arm in the Milky Way. The exceptionally sparse gas of the Local Bubble is the result of supernovae that exploded within the past ten to twenty million years.
What are remnants of a supernova?
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.
How did scientists discover the Local Bubble?
The Local Bubble was discovered gradually in the 1970’s and 1980’s. Optical and radio astronomers looked carefully for interstellar gas in our part of the galaxy, but couldn’t find much in Earth’s neighborhood. Furthermore, there seemed to be a pileup of gas–like the shell of a bubble–about 150 light years away.
What is the Local Bubble How did it form quizlet?
The Local Bubble was probably created by: a nearby supernova perhaps 300,000 years ago, brighter than the Full Moon. primarily in the dense dust clouds. The relative density of dust to gas is least in which place?
What kind of object creates an evacuated very hot bubble in the interstellar gas?
Astronomers think this bubble was blown by some nearby stars that experienced a strong wind and some supernova explosions.
Is interstellar cloud and Nebula the same thing?
A Nebula (Latin for ‘cloud’ or ‘fog’; pl. nebulae, nebulæ or nebulas) is a distinct body of interstellar clouds (which can consist of cosmic dust, hydrogen, helium, molecular clouds; possibly as ionized gases).
Where are supernova remnants located?
Magellanic Cloud
A supernova remnant in the Milky Way, about 8,200 light years from Earth. A supernova remnant located in the Small Magellanic Cloud, about 190,000 light years from Earth. A 1700-year-old pulsar and its nebula, located about 17,000 light years from Earth.
What does supernova remnant look like?
These remnants are a cross between the shell-type remnants and crab-like remnants. They appear shell-like, crab-like or both, depending on what part of the electromagnetic spectrum one is observing them in. There are two kinds of composite remnants: thermal and plerionic.
What is the primary visible color of an emission nebula?
Due to the prevalence of hydrogen in interstellar gas, and its relatively low energy of ionization, many emission nebulae appear red due to the strong emissions of the Balmer series. If more energy is available, other elements will be ionized and green and blue nebulae become possible.
How is interstellar matter distributed through space quizlet?
How is an interstellar medium distributed throughout space, how dense is it? The matter between stars, composed of two components, gas and dust, intermixed throughout all of space. interstellar dust particles are larger in size consequently blocking visible light.
What is bubbles of hot gases?
How hot? About a million degrees. It’s called the “Local Bubble” or “local hot bubble” and is shaped a little like a peanut. Scientists believe it was formed by supernovas, the largest explosions in space, as NASA calls them, that occur when a large star blows up.