2025年1月17日 · Mercury's surface temperatures are both extremely hot and cold. Because the planet is so close to the Sun, day temperatures can reach highs of 800°F (430°C).

2024年3月29日 · Ceres. Ceres is the smallest dwarf planet with an equatorial diameter of about 599 miles (about 964 kilometers). Ceres is about 1/13 the width of Earth.

2024年10月22日 · The universe’s stars range in brightness, size, color, and behavior. Some types change into others very quickly, while others stay relatively unchanged over

6 天之前 · The ocean is warming. Rising greenhouse gas concentrations not only warm the air, but the ocean, too. Research shows that around 90 percent of the excess heat from global …

2025年1月22日 · While Earth is only the fifth largest planet in the solar system, it is the only world in our solar system with liquid water on the surface. Just slightly larger than nearby Venus, …

2003年10月24日 · The Solar System: Planet Sizes. Mercury – 1,516mi (2,440km) radius; about 1/3 the size of Earth; Venus – 3,760mi (6,052km) radius; only slightly smaller than Earth

2016年3月15日 · Our solar system is made up of a star—the Sun—eight planets, 146 moons, a bunch of comets, asteroids and space rocks, ice, and several dwarf planets, such as Pluto.

2024年10月23日 · Human Activity Is the Cause of Increased Greenhouse Gas Concentrations. Over the last century, burning of fossil fuels like coal and oil has increased the concentration of …

2024年10月21日 · Climate change is a long-term change in the average weather patterns that have come to define Earth’s local, regional and global climates. These changes have a broad …

2024年10月22日 · Event Horizon. This is what makes a black hole black. We can think of the event horizon as the black hole’s surface. Inside this boundary, the velocity needed to escape …