2024年5月2日 · As a rather frail young man, the exceptionally talented Kepler turned to mathematics and the study of the heavens early on. When he was six, his mother pointed out a comet visible in the night sky.

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.

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.

2024年12月30日 · This is exactly what we’ll be seeing from Venus and Saturn as they head for a super close approach in mid-January. After the beginning of the month, they quickly get closer and closer each evening, appearing at their most cozy …

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

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 land for agriculture, industry, and other ...

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 the black hole exceeds the speed of light, which is as fast as anything can go.

2024年3月7日 · Taken during instrument calibration, this image helped test Webb’s ability to dig up galactic “fossils.” Ancient galaxies are so far that as space expands, their light has stretched into infrared wavelengths — Webb’s specialty.

2024年10月22日 · Astronomers call stars that are stably undergoing nuclear fusion of hydrogen into helium main sequence star s.This is the longest phase of a star’s life. The star’s luminosity, size, and temperature will slowly change over millions or billions of years during this phase.