Question

The first confirmed detections of extrasolar planets occurred in ____________.
a. 2009
b. the mid-20th century
c. the 1990s
d. the mid-17th century

Answer 1

Answer:

The 1990s

Explanation:

Although there has been sightings of extrasolar planets (also known as exoplanets. These are planets orbiting other stars different from our own sun) long before the 1990s, this was not confirmed until in 1992 when several terrestrial-mass planets was detected orbiting a pulsar (a rotating neutron star that is highly magnetised)

Answer 2

Answer: c. the 1990s  

Explanation: The exact date was January 9, 1992.