6/14/2023 0 Comments Key west radar in motion![]() The BepiColombo spacecraft is planned to arrive at Mercury in 2025. Only two spacecraft have visited Mercury as of 2023: Mariner 10 flew by in 19, and MESSENGER launched in 2004 and orbited Mercury over 4,000 times in four years. Mercury is the most difficult planet to reach from Earth because it requires the greatest change in spacecraft's velocity. In English, it is named after the Roman god Mercurius ( Mercury), god of commerce, communication and the messenger of gods. Like Venus, Mercury orbits the Sun within Earth's orbit, making it appear in Earth's sky only as a "morning star" or "evening star" that's relatively close to the Sun. Mercury's axis has the smallest tilt of any of the Solar System's planets (about 1⁄ 30 of a degree), and its orbital eccentricity is the largest of all known planets in the Solar System. Counterintuitively, due to Mercury's slow rotation, an observer on the planet would see only one Mercurian solar day (176 Earth days) every two Mercurian solar years (88 Earth days each). Mercury orbits the Sun in a 3:2 spin–orbit resonance, meaning that relative to the background stars, it rotates on its axis exactly three times for every two revolutions it makes around the Sun. There are many competing hypothesis about Mercury's origins and development, some of which incorporate collision with planetesimal and rock vaporization.īecause Mercury is very close to the Sun, the intensity of sunlight on its surface is between 4.59 and 10.61 times the solar constant (amount of the Sun's energy received at 1 astronomical unit, which is roughly the distance between Earth and the Sun). At Mercury's poles though, there are large reservoirs of water ices that are never exposed to direct sunlight, which has an estimated mass of about 0.025–0.25% the Antarctic ice sheet. Having almost no atmosphere to retain heat, Mercury has surface temperatures that change wildly during the day, ranging from 100 K (−173 ☌ −280 ☏) at night to 700 K (427 ☌ 800 ☏) during sunlight across the equator regions. Mercury has a dynamic magnetic field with a strength about 1% of that of Earth's and has no natural satellites.Īccording to current theories, Mercury may have a solid silicate crust and mantle overlying a solid outer core, a deeper liquid core layer, and a solid inner core. Despite being the smallest planet in the Solar System with a mean diameter of 4,880 km (3,030 mi), 38% of that of Earth's, Mercury is dense enough to have roughly the same surface gravity as Mars. It is a terrestrial planet with a heavily cratered surface due to the planet having no geological activity and an extremely tenuous atmosphere (called an exosphere). Please consult your device documentation for instructions.Mercury is the first planet from the Sun and the smallest planet in the Solar System. ![]() On mobile devices, you can save the bookmark as an easy-access icon similar to other apps. ![]() For example, if you select "Weather for a location," then select a location, the bookmark will return to your location on your next visit. You may bookmark the URL to return later to the same view with the selected settings. ![]() The URL will automatically update as you select the view and settings. This view is similar to a radar application on a phone that provides radar, current weather, alerts and the forecast for a location. This view combines radar station products into a single layer called a mosaic and storm based alerts. This view provides specific radar products for a selected radar station and storm based alerts. This site is organized into views that provide relevant radar products and weather information for a common task or goal.
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