To find a Deep Space Anomaly in No Man's Sky (NMS), the main method involves obtaining and using an Anomaly Detector, which is a rare item dropped randomly by shooting asteroids in asteroid belts. Once you have an Anomaly Detector, you use it by activating a scan while flying with your pulse drive on until the detector signals the presence of an anomaly, such as living frigates or other deep space objects. When the detector signals an anomaly, you drop out of pulse drive to investigate, scan, and interact with the anomaly. If the anomaly is not what you desire, you can reload a restore point and try again, using the detector efficiently. The best places to find these detectors are near space stations in Gek-controlled systems, around asteroid clouds near black holes, or between planets in Vy'keen systems. Shooting many asteroids increases your chances of acquiring Anomaly Detectors to find deep space anomalies faster. Additionally, the Space Anomaly (a specific entity in NMS) can be summoned once accessed through progressing in the game's storyline involving characters like Nada and Artemis. It appears automatically after certain quests and can be summoned via your ship's menu for travel and interaction. Summary:

• Shoot asteroids in asteroid belts to get Anomaly Detectors.
• Activate the detector by pulsing with your ship to find deep space anomalies.
• Best farming spots include Gek systems near space stations, black hole asteroid clouds, and Vy'keen system asteroid clouds.
• Reload if the anomaly found isn't suitable.
• The Space Anomaly (game entity) appears after story progression and can be summoned from your ship once unlocked.

This method is based on community findings and gameplay mechanics as of recent updates in the game.