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).

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

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.

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 range of observed effects that are synonymous with the term.

2020年10月22日 · Astronomers generally divide black holes into three categories according to their mass: stellar-mass, supermassive, and intermediate-mass. The mass ranges

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 atmospheric carbon dioxide (CO 2).This increase happens because the coal or oil burning process combines carbon with oxygen in the air to make CO 2.To a lesser extent, clearing of …

2017年11月8日 · Like early explorers mapping the continents of our globe, astronomers are busy charting the spiral structure of our galaxy, the Milky Way. Using infrared images from NASA’s Spitzer Space Telescope, scientists have discovered that the Milky Way’s elegant spiral structure is dominated by just two arms wrapping off the ends of a central bar of stars.

2024年10月23日 · Scientists have determined that carbon dioxide plays a crucial role in maintaining the stability of Earth’s atmosphere. If carbon dioxide were removed, the terrestrial greenhouse effect would collapse, and Earth’s surface temperature would drop significantly, by approximately 33°C (59°F).

2025年1月3日 · Date Solar Eclipse Type Geographic Region of Visibility; March 29, 2025: Partial: Europe, Asia, Africa, North America, South America, Atlantic Ocean, Arctic Ocean