With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Social justice is invoked today in efforts for gender equality.
text_B: NGC 7790 is a young open cluster of stars located some 10,800 light years away from Earth in the northern constellation of Cassiopeia .. Cassiopeia. Cassiopeia ( constellation ). open cluster. open cluster. constellation. constellation. At this distance , the light from the cluster has undergone extinction from interstellar gas and dust equal to E -LRB- B -- V -RRB- = 0.51 magnitude in the UBV photometric system .. extinction. Extinction ( astronomy ). magnitude. Magnitude ( astronomy ). UBV photometric system. UBV photometric system. NGC 7790 has a Trumpler class rating of II2m and the estimated age is 60 -- 80 million years .. Trumpler class. Trumpler class. It contains three cepheid variables  : CEa Cas , CEb Cas , and CF Cas .. This cluster is on an orbit through the Milky Way galaxy that has an eccentricity of 0.22 ± 0.07 and a period of -LRB- 225.0 ± 27.1 -RRB- million years .. Milky Way. Milky Way. eccentricity. Orbital eccentricity. period. Orbital period. It will come as close as 6.2 +  /  - to , and as distant as 9.7 +  /  - from , the Galactic Center .. Galactic Center. Galactic Center. The maximum distance reached above -LRB- or below -RRB- the galactic plane is 0.24 +  /  - .. galactic plane. galactic plane. On average , it will cross the galactic plane every -LRB- 35.7 ± 13.0 -RRB- million years .. galactic plane. galactic plane
not_related.