Selected MCQ

Current Question
The exoplanet candidate discovered orbiting Alpha Centauri A is notable because its mass is similar to that of which planet in our Solar System?
  • A. Earth
  • B. Jupiter
  • C. Saturn
  • D. Uranus
Correct Answer: C
Explanation:
Observations suggest an Alpha Centauri A exoplanet with a mass similar to Saturn, likely a gas giant.
Related Question 1
What method do astronomers use when they detect exoplanets by observing a star's light dimming at regular intervals?
  • A. Radial velocity method
  • B. Transit method
  • C. Direct imaging
  • D. Astrometry
Correct Answer: B
Explanation:
The transit method identifies exoplanets by periodic dips in a star's brightness as a planet crosses its face.
Related Question 2
Which nearby star system had four rocky exoplanets confirmed around it by 2025?
  • A. Barnard's Star
  • B. Proxima Centauri
  • C. Sirius
  • D. Vega
Correct Answer: A
Explanation:
Four small rocky planets were confirmed around Barnard's Star (though none are in the habitable zone).
Related Question 3
The interstellar object 3I/ATLAS, discovered in 2025, is classified as which of the following?
  • A. Asteroid
  • B. Comet
  • C. Planet
  • D. Spacecraft
Correct Answer: B
Explanation:
3I/ATLAS is a comet from interstellar space, not bound to the Sun's orbit.