The Ring Nebula is a planetary nebula that currently has a radius of 1.2 * 10¹³ km and an expansion velocity of 250 km/s. Approximately how long ago did its parent star die and eject its outer layers? A) 1,500 years ago B) 3,200 years ago C) 5,400 years ago D) 8,000 years ago E) 28,000 years ago

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The Answer of The Ring Nebula is a planetary nebula that currently has a radius of 1.2 * 10¹³ km and an expansion velocity of 250 km/s. Approximately how long ago did its parent star die and eject its outer layers? A) 1,500 years ago B) 3,200 years ago C) 5,400 years ago D) 8,000 years ago E) 28,000 years ago

The Ring Nebula Is a Planetary Nebula That Currently Has