Why are there closeup videos of solar flares, but it’s too hot on Venus and Mercury to send rovers?


Why are there closeup videos of solar flares, but it’s too hot on Venus and Mercury to send rovers?

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If I understand correctly, the videos you’re thinking of are from looking at the radiation…not an actual optical video.

Venus isn’t just hot. The atmosphere is toxic and it’s pressure is insanely high (around 75 times that of earth’s).

As far a mercury is concerned, I didn’t think there was enough reason to send a rover there. Mercury has virtually no atmosphere and is a lot like our moon. I wouldn’t imagine the cost of a rover type mission to mercury would pack enough of a scientific punch.

Space is freezing. Everywhere. Even close to the sun.

Sunshine has to have *something* to warm up, otherwise it’s just electromagnetic radiation flying through space.

A solar probe could have a radiation shield always pointed toward the sun, and the back side would still be minus a few hundred degrees, even inside of Mercury’s orbit.

On a planet however there’s an atmosphere that picks up the sunshine and turns it into heat. No amount of insulation would keep the heat out of a probe forever, unless there were some kind of active cooling system.

You don’t need to get close to the Sun to take a “closeup” video of solar flares, you just need to zoom in on the flare using a telescope with high magnification. Most space telescopes that study the Sun remain very close to the Earth, either orbiting the Earth directly or stationed at the L1 Lagrange point a hundred times closer to the Earth than to the Sun. You can even use a ground-based telescope to study the Sun, provided you have the proper filters to protect the scope and/or your eyes from its light.

Observation of solar flairs in from earth or satellites with earth like distance to the sun. The use telescopes and fingers to get the right amoound of magnification and lighter.


A solar filter you hca use to observe the sun with a normal camera is not expensive. https://www.amazon.com/solar-filters-cameras/s?k=solar+filters+for+cameras

The main exception to earth-like distance is https://en.wikipedia.org/wiki/Parker_Solar_Probe It has an advantage over any probe in an atmosphere or on a planetary surface, all heat is radiation from the sun that is in one direction from the probe. It the other direction is a cold space you can radiate heat to.

You can compare it to if you are close to a fire, a thin layer of reflective material can reflect away the radiation from the fire and you can cool down by radiating heat to what is colder behind you.

Compare that to a sauna or a summer day with warm air. It is all around you and if you try to insulate from it the difference is how fast you heat up. You need access to something cool too to keep from overheating.