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2. Houzz - Wikipedia

   en.wikipedia.org/wiki/Houzz

   65 million (November 2021) [ 1] Launched. February 2009; 15 years ago. ( 2009-02) Houzz is an American website, online community and software for architecture; interior design and decorating; landscape design and home improvement. It was founded in 2009 and is based in Palo Alto, California .

3. Ultraviolet astronomy - Wikipedia

   en.wikipedia.org/wiki/Ultraviolet_astronomy

   Ultraviolet astronomy is the observation of electromagnetic radiation at ultraviolet wavelengths between approximately 10 and 320 nanometres; shorter wavelengths—higher energy photons—are studied by X-ray astronomy and gamma-ray astronomy. [ 1] Ultraviolet light is not visible to the human eye. [ 2]

4. Solar irradiance - Wikipedia

   en.wikipedia.org/wiki/Solar_irradiance

   Solar irradiance is the power per unit area ( surface power density) received from the Sun in the form of electromagnetic radiation in the wavelength range of the measuring instrument. Solar irradiance is measured in watts per square metre (W/m 2) in SI units .

5. Glossary of astronomy - Wikipedia

   en.wikipedia.org/wiki/Glossary_of_astronomy

   A-type star In the Harvard spectral classification system, a class of main-sequence star having spectra dominated by Balmer absorption lines of hydrogen. Stars of spectral class A are typically blue-white or white in color, measure between 1.4 and 2.1 times the mass of the Sun, and have surface temperatures of 7,600–10,000 kelvin.

6. Planetary nebula - Wikipedia

   en.wikipedia.org/wiki/Planetary_nebula

   All planetary nebulae form at the end of the life of a star of intermediate mass, about 1-8 solar masses. It is expected that the Sun will form a planetary nebula at the end of its life cycle. [8] They are relatively short-lived phenomena, lasting perhaps a few tens of millennia, compared to considerably longer phases of stellar evolution. [9]

7. Sun - Wikipedia

   en.wikipedia.org/wiki/Sun

   Sun. The Sun is the star at the center of the Solar System. It is a massive, nearly perfect sphere of hot plasma, heated to incandescence by nuclear fusion reactions in its core, radiating the energy from its surface mainly as visible light and infrared radiation with 10% at ultraviolet energies.