Astronomy
Observing Tools and Data flashcards
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- What is meant by “Aperture” in this lesson?Telescopes and Resolution
- Aperture is the effective collecting opening and influences light gathering and resolution.
- What is meant by “Reflector” in this lesson?Telescopes and Resolution
- A reflecting telescope uses mirrors as major light-gathering elements.
- What is meant by “Refractor” in this lesson?Telescopes and Resolution
- A refracting telescope uses lenses as major light-gathering elements.
- What is meant by “Angular resolution” in this lesson?Telescopes and Resolution
- Resolution concerns separating nearby apparent features.
- What is meant by “Atmospheric seeing” in this lesson?Telescopes and Resolution
- Seeing is image blurring and fluctuation caused by atmospheric turbulence.
- What is meant by “Adaptive optics” in this lesson?Telescopes and Resolution
- Adaptive optics corrects some atmosphere-induced distortions using measured wavefront changes.
- What is meant by “Radio astronomy” in this lesson?Observing Across Wavelengths
- Radio astronomy measures long-wavelength electromagnetic signals.
- What is meant by “Infrared astronomy” in this lesson?Observing Across Wavelengths
- Infrared astronomy examines wavelengths useful for many cool or dust-related sources.
- What is meant by “Ultraviolet astronomy” in this lesson?Observing Across Wavelengths
- Ultraviolet measurements investigate energetic processes and hot sources in relevant bands.
- What is meant by “X-ray astronomy” in this lesson?Observing Across Wavelengths
- X-ray astronomy studies high-energy radiation often associated with very hot or extreme environments.
- What is meant by “Atmospheric window” in this lesson?Observing Across Wavelengths
- A window is a wavelength range transmitted relatively well by Earth's atmosphere.
- What is meant by “Multiwavelength comparison” in this lesson?Observing Across Wavelengths
- Comparison combines bands to distinguish components and physical conditions.
- What is meant by “Calibration” in this lesson?Calibration, Noise, and Reproducibility
- Calibration relates instrument output to a meaningful measurement.
- What is meant by “Noise” in this lesson?Calibration, Noise, and Reproducibility
- Noise is unwanted variability affecting measurement.
- What is meant by “Signal-to-noise ratio” in this lesson?Calibration, Noise, and Reproducibility
- The ratio compares relevant signal strength with noise under a defined method.
- What is meant by “False-color image” in this lesson?Calibration, Noise, and Reproducibility
- A false-color image assigns display colors to measured quantities or bands.
- What is meant by “Selection effect” in this lesson?Calibration, Noise, and Reproducibility
- A selection effect biases what is detectable or included in a sample.
- What is meant by “Reproducible analysis” in this lesson?Calibration, Noise, and Reproducibility
- Analysis is reproducible when methods and data permit independent checking.