Incandescent bulbs are classified by how much electrical power they use, like 60 watts or 100 watts.This is how old-fashioned fluorescent tubes work, except that the UV light is produced by LEDs instead of an excited gas.
Birds see in four classes of color – blue, red, green and shorter wavelengths – violet or ultraviolet (UV) – depending on the species. Similar studies have looked at the role of the UV color spectrum in the way turkeys select their mates.
NASA Lands Its InSight SpacecraftNASA/JPL-CaltechAfter a six-month journey across hundreds of millions of miles of deep space, NASA's InSight spacecraft—a mission nearly ten years and close to $1 billion in the making—landed successfully on the surface of Mars on Monday, touching down on the planet's surface just a few minutes before 12:00 pm PT.In the final moments of the spacecraft’s descent, the mission control room at NASA's Jet Propulsion Laboratory was silent as updates on InSight's status blared over the PA system: "Altitude 300 meters… 200 meters… 80 meters… 60 meters … 50 meters, constant velocity 37 meters… 30 meters … 20 meters… 17 meters… standing by for touchdown… Touchdown confirmed!
The 1500-pound robot will enter the planet's atmosphere around 12:00 PST in excess of 12,000 miles per hour, its protective aeroshell shielding it from heat-generating friction and treacherous sandstorms on its descent toward the Martian surface.
How and Where to Watch NASA's InSight Finally Land on MarsNASA/JPL-CaltechOn Monday, November 26th, following a six-month journey across hundreds of millions of miles of deep space, NASA's InSight spacecraft will arrive at Mars in suitably dramatic fashion, hitting the top of the planet's atmosphere at 12,300 miles per hour—several times faster than a speeding bullet—shortly before 12:00 pm PST (3:00 pm EST).If all goes as planned, it will take InSight (short for Interior Exploration using Seismic Investigations, Geodesy, and Heat Transport) just seven minutes to decelerate completely and alight on Mars' surface.
On Monday, November 26th, it will attempt its eighth, when it endeavors to land the $830-million InSight spacecraft on Elysium Planitia, a vast plain just north of the Martian equator.If NASA is successful, InSight (short for Interior Exploration using Seismic Investigations, Geodesy, and Heat Transport) will be the first mission to investigate Mars' deep interior with thermal probes and seismometry, an approach scientists think will address questions about the red planet's formation and composition.