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you can often see stars because there is a little amount of light in the sky.Stars really don't disappear in daylight.They were just beaten by the light coming from the sun
luminous - emits light e.g. the sunnon- luminous - does not emit light though will often reflect light e.g. the moon.
the moon changes everyday
To alert ships that they are approaching land.
Infrared light has a large range of applications, and is often utilized where visible light cannot be detected, or something is blocking visible light but does not block infrared light. For example, when looking toward the center of the Milky Way large amounts of dust obscure the visible light that emanates from the center of the galaxy. This dust though does not obscure infrared light at certain wavelengths, and so astronomers can use cameras that are sensitive to this infrared light to obtain a picture of this region of space. Infrared light is also used in thermal imaging systems, and night-vision instruments are often sensitive to the infrared wavelengths that are emitted by warm objects.
How often should you change the fuel filter?
For PC bulbs, its a good idea to change them every 9-12 months.
It depends on how heavy or light you bleed and possibly what pads you use but try every 1 to 2 hours
you should never have to change your oxygen sensors. The only time you have to is if the PCM (powertrain control module) is not recieving any input from them. This would cause an MIL (engine light) to illuminate.
as often as needed
You should change your oil every 3,000 miles. If you drive your car rough, then you should change it more often.
everyday
How often should you change water pump in a boat
Every week
You should change them after every feeding because they should be washed after every feeding.
The average motorist should change the oil every 3000 miles. Oil should be changed more often if driven in dusty condition.
you should change it every week so it will always be clean.