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Exoplanets quick check

A quick check of 3 questions. After you submit, each question shows the right answer and why.

3 of 8 questions, Advanced level. Aimed at the Advanced level, your current depth. Questions you have not answered yet come first.

Show all 8 questions

ScientistQuestion 1 of 3

Which technique did Mayor and Queloz use in 1995 to discover 51 Pegasi b?

ScientistQuestion 2 of 3

An Earth-sized planet (12,700 km across) transits a star 700,000 km across. Using transit depth = (planet diameter ÷ star diameter)², what percentage of the star's light is blocked? Give two decimal places.

AdvancedQuestion 3 of 3

HD 209458 b has about 0.73 times Jupiter's mass and 1.39 times Jupiter's radius. What is its average density as a fraction of Jupiter's? (Density ∝ mass ÷ radius³.) Give two decimal places.