Messier 7: Quiz

Question 1: Giovanni Batista Hodierna observed it before 1654 and counted 30 ________ in it.
Stellar classificationSupernovaBinary starStar

Question 2: At the cluster's estimated distance of 800-1000 ________ this corresponds to an actual diameter of 18-25 light years.
Light-yearAstronomical unitCosmic distance ladderParsec

Question 3: Charles Messier catalogued the cluster in 1764 and subsequently included it in his list of ________-like objects as 'M7'.
Solar SystemCentaur (minor planet)SunComet

Question 4: ________ observations of the cluster reveal about 80 stars within a field of view of 1.3° across.
TelescopeOptical telescopeAstronomyReflecting telescope

Question 5: Messier 7 or M7, also designated NGC 6475 and sometimes known as the Ptolemy Cluster, is an open cluster of stars in the ________ of Scorpius.
CruxTaurus (constellation)Canis MajorConstellation

Question 6: It has been known since antiquity; it was first recorded by the 1st century astronomer ________, who described it as a nebula in 130 AD.
HipparchusPtolemyEratosthenesAlmagest

Question 7: The cluster is easily detectable with the ________, close to the "stinger" of Scorpius.
StarNaked eyeAstronomyOrion Nebula

Source: The Full Wiki (http://quiz.thefullwiki.org/Messier_7)