how can astronomers can measure distances directly to worlds...?

Question

Today, how can astronomers can measure distances directly to worlds like Venus, Mars, the Moon, or the satellites of Jupiter?

using x-ray telescopes

bouncing radar beams off them

sending graduate students out with very long tape measures

using Cepheid variable stars that lie behind the planets

using the Hubble Space Telescope to triangulate with

I thought it would be using Cepheid variable stars that lie behind the planets but I know I'm wrong would it be using the Hubble Space telescope...

Answer 1

Radar