Opposition refers to the act of resisting or standing against something. In various contexts, it can mean disagreement in politics, where one party or group challenges the ideas or policies of another. For example, in a legislative body, the opposition party works to hold the ruling party accountable and provide alternative viewpoints. In astronomy, opposition describes the position of celestial bodies. When a planet is in opposition to the Sun, it is directly opposite the Sun in the sky, making it fully illuminated and often visible all night. This phenomenon occurs with planets like Mars and Jupiter, enhancing their brightness and visibility.