ASTR BC 1753x Lecture Notes - Lecture 9: Asteroid Belt, Nanometre, Axial Tilt
9 Sep 2016
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Venus is twice as far away from the sun as mercury. The only stable surface liquid water in the solar system. A surprisingly large moon (40% size of earth) Atmosphere with the perfect density and oxygen content (21%) You are an alien that wants to measure the temperature of earth. Measure the peak wavelength of light coming from earth. Peak (wavelength) emitted by an object is related to temperature (see graph on powerpoint) As goes up, temperature (t) goes down, and vice versa. = b/t (it is an inverse relationship, hence the division) Where b = 2. 9 x (nm k) nm = nanometer = m. Doesn"t have an atmosphere, so we can see the surface. There are periods when there is water on the surface, but for very limited amounts of time. 0. 1 , 1. 5 au, day is 40 min longer, but year is ~double. More than 100x less air pressure than on earth- your body tissues would bulge.
