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Earth from Space 、。。
By Discovery & National Geographic Ch 、。。

The Earth gravitationally interacts with other objects in space, especially the Sun and the Moon .. During one orbit around the Sun, the Earth rotates about its own axis 366.26 times, creating 365.26 solar days, or one sidereal year .. the Earth's axis of rotation is tilted 23.4° away from the perpendicular of its orbital plane, producing seasonal variations on the planet's surface with a period of one tropical year (365.24 solar days) .. The Moon is the Earth's only natural satellite .. It began orbiting the Earth about 4.53 billion years ago (bya) .. The Moon's gravitational interaction with the Earth stimulates ocean tides, stabilizes the axial tilt, and gradually slows the planet's rotation 、。。

The Earth's internal heat comes from a combination of residual heat from planetary accretion (about 20%) and heat produced through radioactive decay (80%) .. The major heat-producing isotopes within the Earth are potassium-40, uranium-238, uranium-235, and thorium-232 .. At the center, the temperature may be up to 6,000 °C (10,830 °F), and the pressure could reach 360 GPa .. Because much of the heat is provided by radioactive decay, scientists postulate that early in the Earth's history, before isotopes with short half-lives had been depleted, the Earth's heat production would have been much higher .. This extra heat production, twice present-day at approximately 3 byr, would have increased temperature gradients with radius, increasing the rates of mantle convection and plate tectonics, and allowing the production of uncommon igneous rocks such as komatiites that are rarely formed today .、。。

Earth and Earth Sciences Documentaries 、。。

Earth from Space 、。。
By Discovery & National Geographic Ch 、。。

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European Space Agency (ESA) คาดการณ์ว่า เทียนกง 1 จะตกประมาณวันที่ 30 มี.ค. - 3 เม.ย.61 ประเทศไทยมีความเสี่ยง เส้นทางโคจรผ่านดอยอินทนนท์พอดี


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TIRA (Tracking and Imaging Radar) เรดาร์ของเยอรมันจับภาพสถานีอวกาศ Tiangong 1

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European Space Agency (ESA) คาดการณ์ว่า สถานีอวกาศเทียนกง 1 จะตกสู่พื้นโลกประมาณวันที่ 30 มี.ค. - 6 เม.ย.61 ส่วน Japan Aereospace Exploration Agency (JAXA) คาดการณ์ว่า สถานีอวกาศเทียนกง 1 จะตกสู่พื้นโลกประมาณวันที่ 29 มี.ค. - 4 เม.ย.61

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Sapphire: Galactic Traffic Cop 、。。
By LeakSourceCanada 、。。
Credit : CBC News 、。。
Report by Margo McDiarmid - :-

Canada has sent a satellite into space to take on a critical mission, play traffic cop among the junk - filled asteroid superhighway above the Earth 、。。

The Sapphire satellite is the Canadian Department of National Defence's first dedicated operational military satellite .. The space vehicle is about the size of a dishwasher that will act as an orbiting air traffic controller 、。。

Sapphire was built for the Canadian Forces by MacDonald Dettwiler and Associates .. It will be able to monitor every object bigger than 10 centimetres across that is circling the earth 、。。

There was a total of 7 satellites on board the Polar Satellite Launch Vehicle, which blasted off from Satish Dhawan Space Centre on the island of Sriharikota, off India's east coast near Chennai 、。。

Also on board the rocket were :-

The Canadian Space Agency's suitcase-sized NEOSsat satellite, which will look for asteroids and track satellites and space debris 、。。

Two lunch - box sized BRITE satellites, developed as an international project funded mainly by Austria, but drawing heavily on Canadian technological expertise .. They are equipped with the smallest astronomical telescope ever built, which is designed to study some of the brightest stars in the sky 、。。

The SARAL satellite, a joint French-Indian mission designed to study ocean circulation and sea surface elevation 、。。

A three-kilogram Danish satellite that will test the feasibility of receiving identification signals from ships in the Arctic 、。。

A 6.5-kilogram satellite from the U.K. designed to test mobile phone electronics in space 、。。

Sapphire Satellite 、。。

Sapphire .. is a Canadian space surveillance satellite which was launched in 2013 .. Sapphire was constructed by MacDonald, Dettwiler and Associates (MDA) based on an SSTL-150 bus produced by Surrey Satellite Technology (SSTL) and an optical payload produced by COM DEV International 、。。

Sapphire, Canada's first military satellite, is a small spacecraft designed to monitor space debris and satellites within an orbit 3,728 to 24,855 miles (6,000 to 40,000 kilometres) above Earth .. The satellite has been providing data to the United States Space Surveillance Network since January 2014 .. The satellite has a mass of 148 kilograms (326 lb), and carries a three - mirror anastigmat to track artificial objects in medium Earth orbit to geosynchronous Earth orbit .. ISRO's Ball Lock separation system IBL-298 was used for separating the satellite 、。。

The optical system is based on the design of the Space-Based Visible (SBV) sensor. This telescope was developed for the Midcourse Space Experiment .. The CCD used is a CCD47-20bi CCD sensor 、。。

Sapphire (Space Surveillance) - eoPortal Directory - Satellite Missions :-

Sapphire - Gunter's Space Page :-

Canada To Help US Monitor Space with Sapphire Satellite - SpaceNews :-

The Sapphire Satellite—monitoring space objects :-

Space Debris .. Detecting, Tracking and Imaging Space Debris 、。。

Earth 、Earth Sciences & The Space Debris Documentaries 、。。

Solar System Documentary 、Collection 、。。

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TNN 24 รับมือเทียนกง (18 มี.ค.61)

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ใครอยู่เชียงใหม่ ขอเชิญนะคร้าบ

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Thai PBS จับตาสถานการณ์เทียนกง

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