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Re:What If Planet 9 Is a Primordial Black Hole? by _kst_ on Thursday September 26, 2019 @01:10AM (#21078371)
Yes, a black hole with the mass of the Earth would be much smaller. There's an actual size illustration of one in the article.

The gravitational attraction from a given distance from the center would be the same as for Earth. For example, if you're 4,000 miles from the center, you'll experience a 1-g acceleration. The difference is that, because of the black hole's smaller size, you can get a lot closer to it.

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