This past week has been a busy one in the space world: We’re talking about a telescope’s final destination one million miles from Earth, four tons of metal barreling toward the moon and a mystery in the cosmos that is baffling scientists.

Our knowledge of the solar system is expanding. Here’s how scientists define interstellar space.

Read full article: Our knowledge of the solar system is expanding. Here’s how scientists define interstellar space.

This week on Space Curious, a listener wanted to know, "How big is the solar system?"

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PLANETARY SCIENCE

Tech Time in Space: Metal barreling toward moon, a cosmic mystery, more

Our knowledge of the solar system is expanding. Here’s how scientists define interstellar space.