virtually non-existent.

a little less.

very comparable.

a little more.

the surface is just way too hot

the surface is permanently obscured by thick clouds

there is no surface of Venus

too many active volcanoes

True

False

it spins or rotates on its axis way too slow

it has no central iron core

Venus never had oceans and/or plate tectonics like Earth

it revolves around the Sun in a near-perfect circular orbit

elliptical

circular

angular

geometric

Mariner

Magellan

Voyager

Veneras

Magellan

Mariner

Veneras

Pioneer Venus

the orbit of Venus takes it closer to the Sun sometimes

Venus' atmosphere is so thick that it traps the Sun's heat

Mercury has no atmosphere (to speak of)

because Mercury has a fairly substantial magnetic field