Question 1: [13] The ________ brought this first period of discovery to a close,[13] and it was not until 1845 that another object (5 Astraea) was discovered.
Question 2: [17] One hundred asteroids had been located by mid-1868, and in 1891 the introduction of astrophotography by ________ accelerated the rate of discovery still further.
Question 4: The discovery of ________ in 1846 led to the discrediting of the Titius-Bode Law in the eyes of scientists, as its orbit was nowhere near the predicted position.