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Wouldn't we be showered by particles/gamma rays though? I mean... its not only visible light reaching us... but I'm not an astrophysicist

There might be a small increase in background radiation, but B is too far away to do anything dangerous or dramatic.

That would be a fitting end to the year 2020.

700+ light years of inverse square law says we'll get a noticeable ping but nothing remotely harmful.

Also, please happen during wintertime in the northern hemisphere. Covid means I won't be escaping the gloom this year.

I recurrently have these types of dreams:

1. The moon is extremely close to earth, so it covers half of the sky.

2. There's another earth-like planet instead of the moon, also really close.

I love those dreams, they also come in nightmare variety:

1. Planes start falling, then there's a big explosion in the sky and fireballs fall towards the earth.

Does anyone else have these dreams?

The description of your dream made me think of the movie Another Earth. https://www.imdb.com/title/tt1549572/

How long would it last?

Months.