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What are planetary nebulae?

Planets that explode into nebulae
The nursery planets are born from
Gaseous remains of a star after it has expelled its outer layers
Remnants of a star which had planets in its system

A planetary nebula is a region of cosmic gas and dust formed from the cast-off outer layers of a dying star. Despite their name, planetary nebulae have nothing to do with planets.

Tens of thousands of years
Three years
Billions of years
Seven years

Planetary nebulae remain for a relatively short time in cosmic terms — tens of thousands of years — before dissipating into space

Cat eye’s nebula
Dumbbell nebula
Ring Nebula
Horsehead nebula

The Dumbbell nebula, also known as Messier 27 (M27), was the first planetary nebula ever discovered. French astronomer Charles Messier spotted it in 1764.

The nebula’s colour depends on the colour of the star
Particles of dust impart the colour to the nebula
The temperature of the nebula determines the colour
Presence of gases such as helium, nitrogen and oxygen gives them the colour

The brilliant hues of planetary nebulae such as blues, greens, and reds come from glowing gases such as hydrogen, helium, nitrogen, and oxygen.

After it becomes the Red giant
When it is a protostar
When the Sun starts to fade away after being a White Dwarf
As a White Dwarf

All planetary nebulae form at the end of the life of a star of intermediate mass, about 1-8 solar masses. It is expected that the Sun will form a planetary nebula at the end of its life cycle-in 5 billion years or so.

Science Quiz: On Planetary Nebula – Artifex.News

Sci-Five | The Hindu Science Quiz: On Planetary Nebula