Activity for ak7
| Type | On... | Excerpt | Status | Date |
|---|---|---|---|---|
| Question | — |
Locating rogue planet in deep space based on astronomical observations from its surface? Assume that you have a Rogue Planet hurtling through deep space. Somehow, an alien civilization from, say, 1,000 ly away acquires astronomical data from this planet. This data is in the form of high resolution photographs of the sky above said Rogue Planet (presumably no clouds on an ice planet). T... (more) |
— | about 5 years ago |
| Question | — |
How to safely construct deep underground harbors on a Snowball Earth? A radical shift in the Earth's orbit has made the Earth much colder, with all the oceans freezing over, and the atmosphere liquifying and falling as rain. Humans live deep underground in areas of high geothermal potential, such as the Ring of Fire around the Pacific. Apart from tunnels, they also w... (more) |
— | about 5 years ago |
| Question | — |
Black hole collides with Sun: How rapidly is energy released? Basic idea: Primordial black hole (2.5% of Sun's mass) directly approaches Sun at fairly rapid pace (300 km/s). Consequently, six days after passing Earth's orbit, it will collide with the Sun; accounting for additional gravitational acceleration as it approaches, the collision will result in many o... (more) |
— | over 5 years ago |