Part 3/10:
Given the current costs of space travel, interplanetary trade is fraught with difficulties. The expense of sending goods to distant planets, particularly Mars, can soar to $10,000 per kilogram. A significant aspect of these costs comes from the gravitational forces of Earth, which complicate launches and compromises economic feasibility. However, valuable materials, such as precious metals or fusion isotopes, make some trade conceivable despite the steep shipping costs.