Exoplanets — MCQs

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1. What is an exoplanet?





2. Which was the first confirmed exoplanet discovered around a Sun-like star in 1995?





3. Which method is most commonly used to detect exoplanets?





4. The Kepler Space Telescope was primarily designed to detect exoplanets using which method?





5. The first Earth-sized exoplanet in the habitable zone discovered by Kepler is:





6. Which of the following is the nearest known exoplanet to Earth?





7. The “habitable zone” around a star refers to the region where:





8. Which type of planets are most commonly detected due to their large size and close orbit?





9. The radial velocity method detects planets by measuring:





10. TRAPPIST-1 system is famous for having:





11. Which space telescope succeeded Kepler in exoplanet discovery missions?





12. Hot Jupiters are exoplanets that are:





13. What is the main limitation of the transit method?





14. Which exoplanet was the first observed to have an atmosphere?





15. The Goldilocks Zone is another name for:





16. Rogue planets are planets that:





17. Direct imaging of exoplanets is difficult mainly because:





18. Which of the following methods relies on gravitational bending of light?





19. Super-Earths are defined as:





20. What type of stars are considered most stable for hosting habitable exoplanets?





21. Which mission first discovered multiple Earth-sized planets in the habitable zone of a single star?





22. What is the main advantage of the radial velocity method?





23. The James Webb Space Telescope (JWST) is expected to study exoplanets by analyzing:





24. Which of the following planets is considered a “mini-Neptune”?





25. Which exoplanet discovery method detects changes in a star’s brightness as a planet passes in front of it?





26. The term “eccentric orbit” means the planet’s orbit is:





27. Which is the most Earth-like exoplanet discovered around Proxima Centauri?





28. A planet larger than Earth but smaller than Uranus is typically called a:





29. What does “planetary transit depth” measure?





30. Which star system is famous for hosting seven rocky planets, three of which are in the habitable zone?





31. The term “hot Neptune” refers to:





32. Which of the following is the largest exoplanet yet discovered?





33. Which exoplanet is nicknamed “Osiris”?





34. The study of exoplanet atmospheres often looks for biosignature gases like:





35. Which exoplanet discovery technique is most effective for finding distant planets around faint stars?





36. A planet orbiting two stars is called a:





37. Which of the following systems has the largest known number of planets, comparable to our solar system?





38. What is the main limitation of the radial velocity method?





39. The “light curve” of a star is used to study:





40. Which of these exoplanets is often called “Earth’s cousin”?





41. The “escape velocity” of a planet affects:





42. Which star is most commonly targeted for habitable planet searches?





43. The smallest exoplanet discovered so far is about the size of:





44. What is the estimated number of exoplanets discovered to date (2025)?





45. Which space telescope first confirmed the existence of thousands of exoplanets?





46. Which type of exoplanet is most difficult to detect with current technology?





47. The term “orbital period” refers to:





48. Which is the most common type of star hosting exoplanets?





49. Exoplanet detection helps scientists in the search for:





50. The ultimate goal of exoplanet research is to:





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