Venus' lack of magnetic field means that:?

unknown574

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1. there are constant aurorae everywhere on Venus.

2. the surface of Venus has no protection from the Sun's radiation.

3. there is no lightning on Venus.

4. Venus' upper atmosphere is permanently ionized.

5. it doesn't have a liquid metallic core.

which one is it..? please help! I wanna say # 2..
 
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