Which Polish-born astronomer proposed that the planets orbit the sun, and was later proved right?

Why do astronomers hypothesize that a massive black hole lies at the center of m 87?

From the viewpoint of an alien astronomer, how does jupiter affect observations of our sun?

Why do astronomers need different telescope designs to observe across the electromagnetic spectrum?

A) New telescopes incorporate new technology to increase their efficiency.

B) Telescopes have to adapt to the greater distortion of the atmosphere at shorter wavelengths.

C) Photons of different energy behave differently and require different collection strategies.

D) Light pollution is worse at radio wavelengths than visible wavelengths.

E) Astronomers and engineers enjoy the challenge of making new telescope designs.