Science
What is the significance and global impact of NASA's NISAR mission?
NASA's NISAR mission represents a groundbreaking initiative that will have universal impact, affecting virtually every person on Earth through the scientific data it will collect and return. This game-changing mission serves multiple purposes: advancing our understanding of the Moon, laying crucial groundwork for future Mars exploration, and providing vital scientific information that will benefit humanity globally. As part of NASA's extensive portfolio of 140 active missions across the solar system, NISAR exemplifies the agency's leadership in space exploration and scientific discovery, promising remarkable findings that will shape our future understanding of space and Earth.
Watch clip answer (00:09m)
NASA
01:25 - 01:35
Why does the Moon appear larger when it's on the horizon compared to when it's high in the sky?
Despite over 2000 years of scientific inquiry dating back to Aristotle, there is still no definitive consensus on why the Moon appears larger on the horizon. Various theories have been proposed, including the Ponzo illusion and atmospheric effects, but none fully explain this optical phenomenon. Scientists understand that the Moon is not actually closer to Earth when it's on the horizon, yet our perception consistently makes it seem larger. This remains an active area of research as scientists continue investigating the complex interplay between atmospheric conditions and human visual perception to solve this enduring mystery.
Watch clip answer (00:06m)
NASA
01:08 - 01:14
Why does the Moon appear larger when it's positioned on the horizon compared to when it's high in the sky?
The Moon horizon illusion is likely explained by the Ponzo illusion, where our visual perception is influenced by our experience with distant objects. Throughout our lives, we observe that objects like clouds, planes, and ships appear to shrink as they move toward the horizon. However, the Moon maintains its actual size regardless of its position in the sky. To reconcile this inconsistency, our minds compensate by making the Moon appear larger when it's at the horizon. While this is a popular hypothesis among several theories involving atmospheric effects and cognitive biases, scientists are still conducting research to reach a definitive consensus on this fascinating optical phenomenon.
Watch clip answer (00:29m)NASA
00:38 - 01:08
Why does the Moon appear larger when it's on the horizon compared to when it's high in the sky?
The Moon appearing larger on the horizon is primarily an optical illusion rather than a physical phenomenon. Contrary to common assumptions, the Moon is actually about 1.5% farther away when on the horizon and atmospheric refraction slightly compresses its appearance rather than magnifying it. This same illusion affects constellations, which also appear larger near the horizon. The phenomenon has puzzled scientists since Aristotle's time, and while atmospheric effects have been ruled out as the primary cause, researchers continue investigating how our visual perception and psychological factors contribute to this enduring celestial mystery.
Watch clip answer (00:13m)NASA
00:25 - 00:38
Why does the Moon appear larger when it's positioned near the horizon compared to when it's higher in the sky?
The phenomenon of the Moon appearing larger near the horizon remains an unsolved scientific mystery that has puzzled experts for over 2,000 years, dating back to Aristotle's observations. Despite extensive research and ongoing scientific experiments, there is still no definitive consensus on the exact cause of this optical illusion. While scientists have proposed various theories including atmospheric effects and the Ponzo illusion (a visual perception phenomenon), the complete explanation continues to elude researchers, making it one of astronomy's most enduring puzzles.
Watch clip answer (00:17m)NASA
00:05 - 00:22
Why don't academic institutions and researchers publicly discuss significant archaeological discoveries made on private property?
According to John Reeves, there's a deliberate culture of secrecy within academic and research institutions when significant archaeological discoveries are made on private property. Researchers and institutions actively avoid publicizing these finds, choosing instead to keep them hidden from public knowledge. This practice creates barriers to scientific transparency and historical understanding. The reluctance to share discoveries may stem from various factors including institutional politics, concerns about property rights, or potential controversies surrounding the findings. This secrecy ultimately hinders the advancement of archaeological and paleontological knowledge that could benefit broader scientific understanding.
Watch clip answer (00:11m)
JRE Clips
00:14 - 00:26