Artificial satellite images

Sizes and altitudes of satellites Satellites vary in size. Some Altitudes of satellites above the Earth’s surface also vary. These are three common orbits: • Low Earth orbit (LEO) – from 200 to 2,000 km, for example, the ISS orbits at 400 km with a speed of 28,000 km/hour, and time for one orbit is about 90 minutes. • Medium Earth orbit (MEO) – most MEO satellites are at an altitude of 20,000 km, and time for one orbit is 12 hours. • Geostationary orbit (GEO) – 36,000 km above the Earth. Time for one orbit is 24 hours. This is to match the rotation of the Earth so that the satellite appears to stay above the same point above the Earth’s surface. This is used for many communications and weather satellites. The altitude chosen for a satellite depends on the job it is designed for. Navigation satellites The Communication satellites These are used for television, phone or internet transmissions, for example, the Optus D1 satellite is in a geostationary orbit above the equator and has a coverage footprint to provide signals to all of Australia and New Zealand. Weather satellites These are used to image clouds and measure temperature and rainfall. Both geostationary and low Earth orbits are used depending on the type of weather satellite. Weather satellites are used to help with more accurate weather forecasting. Earth observation satellites These are used to photograph and image the Earth. Low Earth orbits are mainly used so that a more detailed image can be produced. Astronomi...

The Hubble Space Telescope is in a low-Earth orbit which means its This is according to a press release published Thursday by researchers at Baltimore's Space Telescope Science Institute (STScI). Now, the scientists plan to do something about it. "We developed a new tool to identify satellite trails that is an improvement over the previous satellite software because it is much more sensitive. So we think it will be better for identifying and removing satellite trails in Hubble images," said Dave Stark of STScI. The new tool is based on the image analysis technique known as the Radon Transform. It identifies satellite trails across Hubble's camera with the widest field of view: the Advanced Camera for Surveys (ACS). "To date, these satellite trails have not had a significant impact on research with Hubble," said Tom Brown, Head of STScI's Hubble Mission Office. "The cosmic rays that strike the telescope's detectors are a bigger nuisance." Messy streaks Radiation from space and artificial satellites hits the ACS electronic detectors on every exposure, leaving behind streaks that mess with the resulting "The average width I measured for satellites was 5 to 10 pixels. The ACS' widest view is 4,000 pixels across, so a typical trail will affect less than 0.5% of a single exposure. So not only can we flag them, but they don't impact the majority of pixels in individual Hubble images. Even as the number of satellites increases, our tools for cleaning the pictures will still be rel...

Stanford researchers have created a new powerful tool that can help estimate the level of poverty across African villages and changes in their development over time. (Image credit: Getty Images) That’s why Stanford scholars The powerful tool they’ve developed combines free, publicly accessible satellite imagery with artificial intelligence to estimate the level of poverty across African villages and changes in their development over time. By analyzing past and current data, the measurement tool could provide helpful information to organizations, government agencies and businesses that deliver services and necessities to the poor. Details of their undertaking were unveiled in the May 22 issue of Nature Communications. “Our big motivation is to better develop tools and technologies that allow us to make progress on really important economic issues. And progress is constrained by a lack of ability to measure outcomes,” said Burke, a faculty fellow at the Stanford Institute for Economic Policy Research (SIEPR) and an assistant professor of earth system science in the School of Earth, Energy & Environmental Sciences (Stanford Earth). “Here’s a tool that we think can help.” Lobell, a senior fellow at SIEPR and a professor of Earth system science at Stanford Earth, says looking back is critical to identifying trends and factors to help people escape from poverty. “Amazingly, there hasn’t really been any good way to understand how poverty is changing at a local level in Africa,” s...

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Sovfoto/UIG via Getty Four radio antennas trailed behind the spacecraft's spherical body. These ensured that the satellite transmitted radio signals equally in all directions regardless of its rotation. Two of them were 7.9 feet (2.4 meters) long, and the other two were 9.5 feet (2.9 meters) long. Sputnik Launch Cake