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No, we do not have a measure for the hardness of an entire planet.
go to ice or fire planet but fire is the hardest
telescope
Scientists do not observe Mercury as often because it is difficult to do so.
The Babylonians, who were credited with writing about both the element and the planet about 3500BC but this does not mean they were the first to observe.
You observe its motion, with respect to the background stars.
The blandest appearing planet based on visuals from space probes is likely to be Venus. Its thick cloud cover hides its surface details, giving it a uniform and featureless appearance when observed from space.
The long-term changes and processes that shape a landscape, such as erosion or tectonic movements, are typically the hardest to observe directly because they occur over extended periods of time. These changes may require specialized equipment or techniques, like remote sensing or geological analysis, to study effectively.
The instrument scientists use to observe the planets is a high powered telescope.
mars =D
A periscope is used to observe the surface from a submarine
No, vision is not always required to observe something. Observing can involve using other senses such as hearing, touch, taste, or smell. People who are visually impaired can still observe and experience the world around them through these other senses.