Tuesday, 19 November 2024
TRAVEL TUESDAY 471 - HUAJIANG CANYON BRIDGE, CHINA
Tuesday, 12 November 2024
TRAVEL TUESDAY 470 - CHONGQING, CHINA
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TRAVEL TUESDAY 469 - KYOTO, JAPAN
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TRAVEL TUESDAY 468 - HAVANA, CUBA
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TRAVEL TUESDAY 467 - IGUAZÚ FALLS, BRAZIL, ARGENTINA
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TRAVEL TUESDAY 466 - 'EL TROPICANA', HAVANA, CUBA
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TRAVEL TUESDAY 465 - CERES, DWARF PLANET
Ceres is a dwarf planet in the middle main asteroid belt between the orbits of Mars and Jupiter. It was the first known asteroid, discovered on 1 January 1801 by Giuseppe Piazzi at Palermo Astronomical Observatory in Sicily, and announced as a new planet. Ceres was later classified as an asteroid and then a dwarf planet, the only one not beyond Neptune's orbit. Ceres's small size means that even at its brightest it is too dim to be seen by the naked eye, except under extremely dark skies. Its apparent magnitude ranges from 6.7 to 9.3, peaking at opposition (when it is closest to Earth) once every 15- to 16-month synodic period. As a result, its surface features are barely visible even with the most powerful telescopes.
Little was known about this dwarf planet until the robotic NASA spacecraft Dawn approached Ceres for its orbital mission in 2015. Dawn found Ceres's surface to be a mixture of water ice and hydrated minerals such as carbonates and clay. Gravity data suggest Ceres to be partially differentiated into a muddy (ice-rock) mantle/core and a less dense but stronger crust that is at most thirty per cent ice by volume. Although Ceres likely lacks an internal ocean of liquid water, brines still flow through the outer mantle and reach the surface, allowing cryovolcanoes such as Ahuna Mons to form roughly every fifty million years. This makes Ceres the closest known cryovolcanically active body to the Sun. Additionally, Ceres hosts an extremely tenuous and transient atmosphere of water vapour, vented from localised sources on its surface.
Ceres follows an orbit between Mars and Jupiter, near the middle of the asteroid belt, with an orbital period (year) of 4.6 Earth years. Compared to other planets and dwarf planets, Ceres's orbit is moderately tilted relative to that of Earth; its inclination (i) is 10.6°, compared to 7° for Mercury and 17° for Pluto.
Although Ceres is not as actively discussed as a potential home for microbial extraterrestrial life as Mars, Europa, Enceladus, or Titan are, it has the most water of any body in the inner Solar System after Earth, and the likely brine pockets under its surface could provide habitats for life. Unlike Europa or Enceladus, it does not experience tidal heating, but it is close enough to the Sun, and contains enough long-lived radioactive isotopes, to preserve liquid water in its subsurface for extended periods. The remote detection of organic compounds and the presence of water mixed with 20% carbon by mass in its near surface could provide conditions favourable to organic chemistry.
If you are interested in things extraterrestrial, science fiction and science fact, aliens, astrophysics, astronomy, exoplanets and SETI, you can follow me on my Instagram account, where I consider such things mainly in pictorial form: @nicvard
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TRAVEL TUESDAY 464 - LISBON, PORTUGAL
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TRAVEL TUESDAY 463 - CAPE COD, USA
Welcome to the Travel Tuesday meme! Join me every Tuesday and showcase your creativity in photography, painting and drawing, music, poetry, creative writing or a plain old natter about Travel.
There is only one simple rule: Link your own creative work about some aspect of travel and share it with the rest of us.
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Beginning in 1797, lighthouses were erected along Cape Cod to aid in navigation. Highland Light (or Cape Cod Light) is the oldest and tallest of these, and remains as one of a number of working lighthouses on Cape Cod and the Islands. Many of Cape Cod's earliest lighthouses featured a light tower that was attached directly to, and centred on the roof of the keeper's dwelling. A stairway to the lantern room was accessible only from the top floor of the house. This came to be known as a Cape Cod style lighthouse, yet today, the only fully intact specimens are on the west coast of the United States.
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TRAVEL TUESDAY 462 - NIUE, OCEANIA
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TRAVEL TUESDAY 461 - NIAGARA FALLS, NORTH AMERICA
Welcome to the Travel Tuesday meme! Join me every Tuesday and showcase your creativity in photography, painting and drawing, music, poetry, creative writing or a plain old natter about Travel.
There is only one simple rule: Link your own creative work about some aspect of travel and share it with the rest of us.
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Niagara Falls is famed for its beauty and is a valuable source of hydroelectric power. Balancing recreational, commercial, and industrial uses has been a challenge for the stewards of the falls since the 19th century. Niagara Falls is 27 km northwest of Buffalo, New York, and 69 km southeast of Toronto, between the twin cities of Niagara Falls, Ontario, and Niagara Falls, New York.
Niagara Falls was formed when glaciers receded at the end of the Wisconsin glaciation (the last ice age), and water from the newly formed Great Lakes carved a path over and through the Niagara Escarpment en route to the Atlantic Ocean.
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TRAVEL TUESDAY 460 - YOKOHAMA, JAPAN
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TRAVEL TUESDAY 459 - SEOUL, STH KOREA
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TRAVEL TUESDAY 458 - DUBLIN, IRELAND
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TRAVEL TUESDAY 457 - BRUGES, BELGIUM
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TRAVEL TUESDAY 456 - YEREVAN, ARMENIA
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