SME
Grade 12 Science · Problem type
From the ground or only from space?
Use this for “Why must X-ray telescopes be put in space?”
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Can a telescope on the ground see it?
Tap a card, then tap its group.
Assumptions
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The air lets through visible light and radio waves, and blocks most of the rest.
•
Ozone absorbs ultraviolet; water vapor absorbs most infrared.
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Matching a star’s lines to elements
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The sun and stellar evolution: fusion, the H-R diagram, nucleosynthesis and black holes
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Related lessons
Light, spectra, telescopes and distances to stars
Main lesson
A star’s Doppler shift
Use this for “A star’s Hα line is seen at 656.5 nm. How fast is it moving, and which way?”
A telescope’s magnification and light-gathering
Use this for “A telescope has a 900 mm objective and a 25 mm eyepiece. What is its magnification?”
Distance from parallax
Use this for “A star’s parallax is 0.1″. How far away is it, in parsecs and light-years?”
Matching a star’s lines to elements
Use this for “Which elements are in this star?” from its dark lines and lab spectra.