Futatsu no Spica

the similarity of these anime is that they both tackle about planets and stars, and how they love it and explore/learn things related to it, with their friends.. 

Both being of sci fi oriented plots with a focus on a young cast as well as their motivations into their goals. 

Yu-Gi-Oh S0 and Twin Spica are two fantasy anime aimed at men (Yu-Gi-Oh is shounen while Twin Spica is seinen). The main character is a somewhat shy high school freshman who is fairly small for their age and is constantly tested by those around them; they are also followed around by a mysterious spirit who helps them in some way. While Twin Spica is definitely more slower-paced and less action-packed than Yu-Gi-Oh, both anime have a similarly wholesome friend group as the main cast and the OPs feature great songs. 

both focusing on young female mcs achieving their dreams and the troubles along the way as well too and also elements of supernatural in it as well. 

Human drama about space exploration, which faces tragedy as often as it faces success. 

Futatsu no Spica, which opens in 2024, and Uchuu Kyoudai, which opens in 2025, provide two different futures of Japan's space program. One portrays the journey toward space as something that has had setbacks because of tragic events, while the other portrays it as the culmination of continuous advances. However, both also portray space travel as a dream that can come true in spite of the challenges that the characters face. Both works are also heartwarming in their characterization and in their message: that one can become stronger to overcome the past and move toward the future.