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Author Archives: lin0214
WFIRST, which stands for Wide Field InfraRed Survey Telescope, is NASA’s observatory that is designed to research the area of dark energy, exoplanets, as well as infrared astrophysics for six years. WFIRST’s primary mirror is 2.4 meters, which is 7.9 feet, in diameter. This size is the same as the size of Hubble Space Telescope’s … Continue reading The Wide Field Infrared Survey Telescope (WFIRST) → Continue reading → Continue reading
Uranus is one of the gas giants in our solar system. Unlike most of the objects in our solar system, Uranus is rotating in an opposite direction, which means it is rotating clockwise if viewed from Earth’s north pole. However, this is not a unique feature. In fact, Venus does this as well. Uranus’s tile … Continue reading Some Interesting Facts about Uranus → Continue reading → Continue reading
Callisto is one of Jupiter’s moons, and it is one of the four Galilean moons. Compared to Earth’s Moon, Callisto’s diameter is about 1.4 times that of the Moon and 1.5 times in mass. The distance between its parent planet, Jupiter, and Callisto is about 5 times the distance between Earth and our Moon. From … Continue reading Facts About Callisto → Continue reading → Continue reading
It is very hard to drill to the deepest part of the Earth. However, there are some indirect measurements that allow us to know limited information about the interior structure of the Earth. One of those is the measurement of seismic waves. By knowing the characteristic of seismic waves, we are able to identify the properties … Continue reading Measuring the Interior of the Earth → Continue reading → Continue reading
Tides happen everyday, but there are certain types of tides do not happen everyday. The strongest tides and the weakest tides are called spring tides. Spring tides happen when the Sun and Moon are aligned, causing unusually strong gravitational forces and resulting very high and very low tides. Because it takes a month for the Moon … Continue reading Spring tides and Neap tides → Continue reading → Continue reading
Radio waves actually travel at the speed of light in vacuum, which is about 300,000,000 meters per second. It is fast enough for anyone on Earth to contact others on Earth in less a second. Radio waves are electromagnetic waves, so is light. The differences between light and radio waves are their frequencies and wavelengths. Wavelengths … Continue reading How do radio waves differ from visible light → Continue reading → Continue reading
Johannes Kepler (December 27, 1571- November 15, 1630), summarized his discoveries with three physical principles. First, the planets move in elliptical orbits, but not perfect circles, with the Sun at one focus. Second, he argued that the time necessary to traverse any arc of a planetary orbit is proportional to the area of the sector between … Continue reading Historical Astronomers in Context → Continue reading → Continue reading
The speed of light is 299,792,458 meters per second (186,282 miles per second), but this is not always the case. The speed of light, which is actually the highest speed that light can reach, has to be in a vacuum. In other cases, light actually slows down as it passes through different media. For instance, … Continue reading Some facts about the speed of light → Continue reading → Continue reading