4 ms·
Wait - we can't infer this using orbit size and speed plus the volume of body? Is it more about distribution of density throughout the body?
by nickpinkston 15y ago
Wait - we can't infer this using orbit size and speed plus the volume of body? Is it more about distribution of density throughout the body?
- cryptoz 15y agoI'm not sure what we know about this particular planet so far, but I think the part that's missing is volume. Currently, nobody knows what the composition of the planet is. We don't know if it's liquid or solid, for example. I think.
- cbr 15y agoThe radius is known (2.4x earth), so why wouldn't we have the volume?
- Tossrock 15y agoOrbit size and speed have no relation to planetary density by themselves. If we knew the total kinetic energy of the planet, then they would, but we don't.
- nickpinkston 15y agoSo you're saying that we can't get the weight using it's speed, orbit radius and planet volume? I think I remember this question on my Physics I test! http://en.wikipedia.org/wiki/Centripetal_force#Formula http://en.wikipedia.org/wiki/Centripetal_force#Formula We have: r, v, m-star, f-star - so m-planet follows right?
- Tossrock 15y agoWe don't have "f-star"; the centripedal force (or the force of gravity in this case) is the product of both the mass of the star and the mass of the planet, which we don't have.