Home › World Scholar's Cup › Science › Science and Technology › An astronomer can only measure how long a distan…
An astronomer can only measure how long a distant body takes to circle the Sun. She finds its distance using that:
ATime to rotate
BTime to cool
CTime to rise
DTime to orbit
Answer & Solution
Correct answer: D. Time to orbit
1. The law relates period and distance.
2. Timing one gives the other.
3. It uses the time it takes to orbit.
_Source: OpenStax Astronomy 2e, Chapter 3, Orbits and Gravity._
Related questions
Most asteroids were already there before the planets themselves took shape. That makes theA student counts up the moons known to circle Pluto. The count is:The largest asteroid is big enough to be classed as a dwarf planet too. It is:Ganymede, Callisto and Titan are each about half frozen water. The other half is:Two worlds spin about an axis tipped almost onto its side. They are:One planet spins backwards, very slowly, against the usual direction of the others. That pA slow rain of projectiles from space has pockmarked solid surfaces across the solar systeFor a huge batch of uranium atoms, the time in which the odds of decay are fifty-fifty is