Parker Solar Probe, launched August 12, 2018 on a Delta IV Heavy, became NASA’s first mission to fly through the Sun’s corona and “touch the Sun” in April 2021 when it crossed the Alfvén critical boundary during its 8th orbit. At its closest approaches Parker reaches about 3.8–4 million miles (6.2 million km) from the…
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The Nancy Grace Roman Space Telescope is planned to launch in late 2026 (latest commitment by May 2027) aboard SpaceX’s Falcon Heavy to a halo orbit around the Sun-Earth L2, about 1.5 million kilometers from Earth. Roman uses a 2.4-meter primary mirror repurposed from Hubble and a 300-megapixel Wide Field Instrument that covers about 0.28…
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NASA’s Hyperion, launched in 2000 on the EO-1 satellite, collected 220 spectral bands from 400 to 2500 nm at 30 m resolution. A hyperspectral data cube stacks hundreds of narrow wavelength bands for every ground pixel, creating a two-dimensional spatial image plus a spectral dimension. Hyperspectral imaging records hundreds of narrow bands (often 10 nm…
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As of mid-2025, Starlink operates about 7,500 active satellites, the largest fleet in history, accounting for more than 60% of all active satellites. Starlink’s next-generation satellites (v2) weigh about 800 kg each, vs 260 kg for v1, and use inter-satellite laser links to route data across continents. Amazon’s Project Kuiper plans 3,236 LEO satellites at…
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GSSAP-1 and GSSAP-2 were launched on July 28, 2014 aboard a Delta IV M+(4,2) from Cape Canaveral, accompanied by the ANGELS experimental satellite. The GSSAP satellites operate in near-geosynchronous orbit roughly 35,900 km (22,300 miles) above Earth and function as a “neighborhood watch” for the GEO belt, providing space situational awareness to USSPACECOM. Built by…
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Starlink has launched over 8,000 satellites since 2019, serves 125 countries, and by April 2025 reached the 250th dedicated Starlink launch, establishing SpaceX’s network as the largest in orbit. OneWeb, founded in 2014, began Gen1 launches in 2019 with 618 of 648 satellites deployed by March 2023, filed for Chapter 11 in 2020, was rescued…
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Starlink is available in over 100 countries as of mid-2025, spanning North America, Europe, Asia, Africa, Oceania, and parts of South America. As of late 2024, Starlink had surpassed 4 million subscribers. Starlink offers five service types: Residential, Roam, Business (Priority), Maritime, and Aviation. Typical speeds range from about 50 Mbps to 150+ Mbps, with…
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Starlink is a SpaceX satellite internet constellation that began launching in 2019 to deliver broadband virtually anywhere on Earth. As of late 2024, SpaceX had launched over 7,000 Starlink satellites, with FCC authorization for about 12,000 and potential expansion beyond 30,000 in the future. Starlink satellites orbit at approximately 550 km altitude in multiple orbital…
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