Excel 4.0 Workbook. .xlw. An Excel 4.0 file format that saves only worksheets, chart sheets, and macro sheets. You can open a workbook in this file format in Office Excel 2007, but you cannot save an Excel file to this file format.
According to scientists, the surface of Neptune is one of the coldest places in the Solar System. At its surface, where the clouds of the planet touch space, the temperature of Neptune can dip down to 55 Kelvin. Thatâs -218 degrees Celsius. Neptune and its Great Dark Spot.
Atmospheric composition. Neptune's atmosphere is made up predominately of hydrogen and helium, with some methane. The methane is part of what gives Neptune its brilliant blue tint, as it absorbs red light and reflects bluer colors. Uranus also has methane in its atmosphere, but has a duller shading.Something else must be contributing to Neptune's hue, but scientists aren't certain what. The planet has ten to a hundred times more methane, ethane, and ethyne at its equator than it does at its poles.he clouds of Neptune vary with the altitude. Cold temperatures allow methane clouds to condense in the highest layers of the atmosphere. Scientists think that clouds made up of ammonia and hydrogen sulfide exist at higher pressures.