ASTRONOMY Martian polar caps Dont Change with Martian the se

ASTRONOMY

Martian polar caps, Don\'t Change with Martian the seasons Are larger than the Earth\'s. Are very much larger than Earths\'s Change with Martian seasons. Why don\'t we have either a Solar or Lunar Eclipse each month? The Earth is not always on the ecliptic plane. The Moon\'s orbit is tipped about 5degree relative to the plane of the Ecliptic. The Moon has an eclipse each Month they are just not visible. The Sun is not always on the Ecliptic plane.

Solution

(14) :

Mars has bright polar caps which make dramatic changes with the seasons. In the winter season for a pole, the cap becomes much larger as carbon dioxide freezes on the surface (dry ice). This happens when the temperature drops to about 150K. The cap gradually increases in size, extending down to about latitude 50° by the beginning of spring.

During the Martian summer, the caps recede but never completely disappear. The permanent cap at the Martian north pole is formed not of dry ice, but of ordinary water ice. The residual north polar cap has been measured to be about 1000 km in diameter. Measurements from Global Surveyor indicate a thickness of about 3 km for this ice cap.

Hence the answer is (D) , Change with Martian seasons.

(15) :

If the Moon\'s orbit around the Earth were in the same plane as the Earth\'s around the Sun (the ecliptic,) we would indeed have a monthly eclipse. However, the Moon\'s orbit is inclined about 5 degrees to the Earth\'s orbit. The Moon passes through the ecliptic only twice a month at a pair of points called the nodes. The rest of the time the Moon is either above or below the plane of the Earth\'s orbit and does not pass directly through the Earth\'s shadow.

Hence answer is (B), The Moon\'s orbit is tipped about 5⁰ relative to th plane of the Ecliptic.