Ground visual and
radar observations indicate that the craft has split into at least two pieces and is likely spinning.
Not exact matches
The densities and chemical compositions of the two rocky planets are also similar, and
radar observations found that Venus has relatively few craters
indicating a relatively young or quickly changing surface like Earth.
Subtle dynamical motions measured by Earth - based
radar, the observed parameters of its gravity field, and
observations of the magnetic field
indicate that Mercury's core is at least partially liquid with an active core dynamo.
Simulations with high - and low - density dendrites and aggregates also bracketed the
radar observations (Fig. 3),
indicating that a mixture of dendrite types could explain the
radar observations.