shanethornhill

Space Technology

Spectral Resolution: How Telescopes Distinguish Light Wavelengths

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Spectral resolution decides how sharp a telescope splits colors. Higher resolution reveals velocity shifts and chemistry; lower gathers light faster.
Science Explainers

How Astronomers Predict Meteor Shower Peak Times Using Orbital Science

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Astronomers predict meteor shower peaks by mapping comet dust trails and finding where Earth crosses the densest stream—here's how it works.
Skywatching

How to Measure Stellar Radial Velocity Using Doppler Spectroscopy

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Learn how to measure a star's wobble using Doppler spectroscopy, from spectrum capture to velocity calculation, with calibration tips and error checks.
Earth Observation

How to Interpret NDVI Values from Satellite Imagery for Vegetation Health Analysis

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Learn what NDVI numbers really mean for plant health, from the calculation to common ranges and quick checks that prevent misreading satellite maps.
Earth Observation

SAR Backscatter: How Radar Brightness Reveals Surface Roughness

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SAR brightness maps surface roughness. Learn how small bumps scatter radar, smooth areas go dark, and what wavelength reveals.
Space Missions

How TESS Finds and Confirms Small Exoplanets Through Transit Detection

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TESS spots planets smaller than Earth by detecting 0.02% light dips in stars. Here's how photometry finds them and follow-up checks confirm they're real.
Space Missions

Common Spectroscopy Techniques Used in Major Telescope Discoveries and Their Breakthrough Applications

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Learn how telescopes split light into chemical fingerprints—the spectroscopy techniques behind exoplanets, dark energy, and distant galaxies.
Astronomy

April Meteor Shower: Peak Viewing Times and Rates

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The April Lyrids peak April 22, 2026 at 19:15 UTC. Expect 10-15 meteors per hour after midnight under dark skies. Here's when and how to watch.
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