What does an emission nebula look like?
Emission nebulae tend to be red in color because of the abundance of hydrogen. Additional colors, such as blue and green, can be produced by the atoms of other elements, but hydrogen is almost always the most abundant. A fine example of an emission nebula is the Orion Nebula (M42).
What are the characteristics of an emission nebula?
Emission nebula, in astronomy, a bright, diffuse light sometimes associated with stars whose temperatures exceed 20,000 K. The excitation process necessary to provide observed optical and radio energies in such gaseous regions was long an astronomical puzzle.
What are the different types of emission nebula?
Among the several different types of emission nebulae are H II regions, in which star formation is taking place and young, massive stars are the source of the ionizing photons; and planetary nebulae, in which a dying star has thrown off its outer layers, with the exposed hot core then ionizing them.
What causes a emission nebula?
Emission nebulae are clouds of ionised gas that, as the name suggests, emit their own light at optical wavelengths. One of the most common types of emission nebula occurs when an interstellar gas cloud dominated by neutral hydrogen atoms is ionised by nearby O and B type stars. …
Can you breathe in a nebula?
No. There would be nowhere near enough oxygen to breathe. A nebula is extremely thin. Also, most of those particles will be hydrogen and helium – even oxygen-rich nebulae are mostly hydrogen and helium.
Is there oxygen in a nebula?
You breathe it every minute, but there’s hardly any molecular oxygen—otherwise known as O2—in space. In fact, astronomers have detected interstellar molecular oxygen in only two places: the Orion Nebula and the Rho Ophiuchi cloud.
What planet has the most oxygen besides Earth?
The global ocean on Jupiter’s moon Europa contains about twice the liquid water of all the Earth’s oceans combined. New research suggests that there may be plenty of oxygen available in that ocean to support life, a hundred times more oxygen than previously estimated.
What planet can support life besides Earth?
A 2015 review concluded that the exoplanets Kepler-62f, Kepler-186f and Kepler-442b were likely the best candidates for being potentially habitable. These are at a distance of 1,200, 490 and 1,120 light-years away, respectively.
Can Kepler 22b support life?
However, the habitability of Kepler-22b is not necessarily a sure thing. It is only listed in an “optimstic sample” of potentially habitable planets at The Habitable Exoplanets Catalog (a project of the Planetary Habitability Laboratory of the University of Puerto Rico at Arecibo).
What would happen if you went on Mercury?
This means that you could jump three times as high on Mercury, and heavy objects would be easier to pick up, Blewett said. However, everything would still have the same mass and inertia, so you could be knocked over if someone threw a heavy object at you, he added.
How long is a day on Mercury?
58d 15h 30m