I could be wrong about this, but I don't think it's possible to observe nebulae (properly so called) in any galaxy other than our own, because they're too faint and too far away.
a large elliptical galaxy
Ionization nebulae are most commonly found in regions of active star formation, such as stellar nurseries like the Orion Nebula in the Milky Way. These nebulae are energized by the ultraviolet radiation emitted by hot, young stars, causing the surrounding gas to ionize and emit colorful light.
Earth is IN a galaxy - as is the nebula.
A Galaxy is far bigger than a nebula.
A nebula galaxy does not exist.
The Orion nebula is part of our own galaxy (the Milky Way). The Orion nebula is about 1500 light-years away from us. Our galaxy is about 100000 light-years across.
You would least expect to find an ionization nebula in a region that lacks hot, massive stars. These stars are responsible for emitting the high-energy ultraviolet radiation needed to ionize the gas in the nebula and make it visible. Therefore, areas with mainly low-mass and old stars would be less likely to host an ionization nebula.
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Galaxy
Yes. There are many planetary nebulae in our galaxy.
Universe, galaxy,nebula,solar system, star, planet
No, a nebula is not a galaxy. A nebula is a cloud of gas and dust in space, while a galaxy is a collection of stars, gas, dust, and dark matter held together by gravity. Galaxies can contain nebulae, among other structures.