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The hottest, brightest main sequence stars are spectral class

The lines present in a chemical’s emission spectrum are at different wavelengths than for that chemical’s absorption spectrum.

Which Jovian planets appear blue due to methane clouds in their atmosphere? Check all that apply.

Saturn has a similar atmospheric chemistry to Jupiter, but looks different. Why is this?

Rings around a planet are permanent features that stay stable for billions of years.

The Keck telescopes are located on the top of a tall, extinct volcano in Hawa’ii. The Hubble Space Telescope is in outer space. The Kecks and the Hubble have the same resolution and light-gathering power. What advantages does the Hubble have over the Kecks?

A parsec is the distance at which the change in the star’s apparent position with a baseline of 1AU is one arc-second.

Which planet is closest to Earth?

Saturn’s rings are made of 

The largest radio telescopes are smaller than the largest optical telescopes.