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sampathsris
sampathsris
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Make it a Failed Alien Experiment

As other answers have put it, it's pretty unlikely an object similar to your description will naturally occur. So my suggestion to you is to make it into a failed alien experiment. This will add mystery to your story, and as a bonus makes great grounds for prequels and sequels.

Some long extinct alien race have accumulated a large amount of very dense material in an orbit around the system. About a million years have passed now, in which time comets and the remnants of the proto-stars have created a very thin (~50-100 meter) crust on the object. Atmosphere was also created by the aliens, who seem to have breathed Oxygen, just like humans.

Densest material known to humans is the quark-gluon plasma, but that might be too exotic, and needs special containers, which are unlikely to survive million years. The densest known element is Osmium, and Iridium follows closely. If we use an Osmium-Iridium alloy, the density will be slightly more than 2.2 kgm-3. If we account for the thin crust and settle for a mean density of 2.2 kgm-3, for a planetoid with 0.25 Earth radii you will get a gravitational acceleration of very nearly 1 g (9.78 ms-2). For a Moon-sized planetoid, gravity will be 10.68 ms-2, and will give you the slightly dense atmosphere you wanted.

Make it a Failed Alien Experiment

As other answers have put it, it's pretty unlikely an object similar to your description will naturally occur. So my suggestion to you is to make it into a failed alien experiment. This will add mystery to your story, and as a bonus makes great grounds for prequels and sequels.

Some long extinct alien race have accumulated a large amount of very dense material in an orbit around the system. About a million years have passed now, in which time comets and the remnants of the proto-stars have created a very thin (~50-100 meter) crust on the object. Atmosphere was also created by the aliens, who seem to have breathed Oxygen, just like humans.

Densest material known to humans is the quark-gluon plasma, but that might be too exotic, and needs special containers, which are unlikely to survive million years. The densest known element is Osmium, and Iridium follows closely. If we use an Osmium-Iridium alloy, the density will be slightly more than 2.2 kgm-3. If we account for the thin crust and settle for a mean density of 2.2 kgm-3, for a planetoid with 0.25 Earth radii you will get a gravitational acceleration of very nearly 1 g. For a Moon-sized planetoid, gravity will be 10.68 ms-2, and will give you the slightly dense atmosphere you wanted.

Make it a Failed Alien Experiment

As other answers have put it, it's pretty unlikely an object similar to your description will naturally occur. So my suggestion to you is to make it into a failed alien experiment. This will add mystery to your story, and as a bonus makes great grounds for prequels and sequels.

Some long extinct alien race have accumulated a large amount of very dense material in an orbit around the system. About a million years have passed now, in which time comets and the remnants of the proto-stars have created a very thin (~50-100 meter) crust on the object. Atmosphere was also created by the aliens, who seem to have breathed Oxygen, just like humans.

Densest material known to humans is the quark-gluon plasma, but that might be too exotic, and needs special containers, which are unlikely to survive million years. The densest known element is Osmium, and Iridium follows closely. If we use an Osmium-Iridium alloy, the density will be slightly more than 2.2 kgm-3. If we account for the thin crust and settle for a mean density of 2.2 kgm-3, for a planetoid with 0.25 Earth radii you will get a gravitational acceleration of very nearly 1 g (9.78 ms-2). For a Moon-sized planetoid, gravity will be 10.68 ms-2, and will give you the slightly dense atmosphere you wanted.

Source Link
sampathsris
sampathsris
  • 709
  • 4
  • 11

Make it a Failed Alien Experiment

As other answers have put it, it's pretty unlikely an object similar to your description will naturally occur. So my suggestion to you is to make it into a failed alien experiment. This will add mystery to your story, and as a bonus makes great grounds for prequels and sequels.

Some long extinct alien race have accumulated a large amount of very dense material in an orbit around the system. About a million years have passed now, in which time comets and the remnants of the proto-stars have created a very thin (~50-100 meter) crust on the object. Atmosphere was also created by the aliens, who seem to have breathed Oxygen, just like humans.

Densest material known to humans is the quark-gluon plasma, but that might be too exotic, and needs special containers, which are unlikely to survive million years. The densest known element is Osmium, and Iridium follows closely. If we use an Osmium-Iridium alloy, the density will be slightly more than 2.2 kgm-3. If we account for the thin crust and settle for a mean density of 2.2 kgm-3, for a planetoid with 0.25 Earth radii you will get a gravitational acceleration of very nearly 1 g. For a Moon-sized planetoid, gravity will be 10.68 ms-2, and will give you the slightly dense atmosphere you wanted.