This episode's question is: what is the Roche limit? If you have feedback or a topic suggestion you can email us.

This episode's question is: what and where are planetary rings? If you have feedback or a topic suggestion you can email us.

This episode's question is: what is parallax? If you have feedback or a topic suggestion you can email us.

Occasionally, rather than asking a specific question, we ask Stuart why he finds something interesting. This episode's question is: what is interesting about Pluto? If you have feedback or a topic suggestion you can email us.

This episode's question is: why are rocky planets closest to the sun while gaseous planets are further away? If you have feedback or a topic suggestion you can email us.

This episode's question is: what is Einstein's theory of general relativity? If you have feedback or a topic suggestion you can email us.

This episode's question is: what is Einstein's theory of general relativity? If you have feedback or a topic suggestion you can email us.

This episode's question is: what is the cosmic microwave background and why does it matter? If you have feedback or a topic suggestion you can email us.

Occasionally, rather than asking a specific question, we ask Stuart why he finds something interesting. This episode's question is: what is interesting about Jupiter? If you have feedback or a topic suggestion you can email us.

This episode's question is: what is the Doppler Effect and why is it important? If you have feedback or a topic suggestion you can email us.