Isaac Asimov’s 1990 novel Nightfall happens on Kalgash, a planet lit up by a ring of stars that lone sees nightfall once like clockwork. It was named the best science-fiction short story ever by the SFWA in 1964, yet the inquiry that has been interesting astrophysicists like Sean Raymond is whether a planet like Kalgash would ever exist.
It turns out the appropriate response is yes—all it takes is eight stars, a dark gap, and a couple very much put moons.
Obviously, the thought came to Asimov in the wake of perusing a Ralph Waldo Emerson quote: “If the stars ought to seem one night in a thousand years, how might men accept and revere, and save for some ages the recognition of the city of God!”
When he specified this to John W. Campbell, the originator of Astounding Stories, Campbell had an alternate interpretation of what might happen: “I figure men would go frantic.”
This is the course Asimov takes in his story: when night at long last falls on Kalgash, it causes far reaching madness over the planet because of the mental stun, and accelerates the obliteration of human advancement.
Sean Raymond began to look all starry eyed at this story, however he needed to know whether Kalgash’s (known as ‘Lagash’ in the short story adaptation) unending sunlight could occur in a genuine star framework.
In the wake of displaying a wide range of arrangements, he found that few potential frameworks could make the correct impact. One framework includes a ring of eight similarly separated sun-like stars circling a huge dark gap, with another red small star circling inside the ring and an Earth-like planet circling the red diminutive person.
Another framework includes two rings of stars circling a dark, with an Earth-like planet circling between the two rings. These setups would make interminable sunlight, yet the increases of fittingly measured moons could make sun powered shrouds that would impersonate the uncommon times of haziness Asimov portrayed in Nightfall.
On the off chance that this sounds unrealistic to you, consider that the researchers of Kalgash experience difficulty trusting a planet with a day by day night cycle could exist: one of the stargazers in the story claims “life would be inconceivable on such a planet.
It wouldn’t get enough warmth and light, and on the off chance that it pivoted there would be add up to dimness half of every day. You couldn’t expect life—which is on a very basic level subject to light—to create under those conditions.”