The Universe Part-3

The axis of the magnetic field of Earth is different at different 1 places, not equally inclined at 23.5 Thus, statement 1 is  wrong. Earlier the magnetic pole of the Earth in Northern hemisphere is situated at Queen Elizabeth Island of Northern Canada not on a peninsula, thus, statement (2) is also incorrect. Thumba is an ideal location for satellite launches because of its proximity to the geomagnetic equator. This is the reason for establishing Thumba Equatorial Rocket Launching Station (TERLS) here as it proves to be a suitable place for satellite launch. Thus statement 3 is true, and option (d) is correct.

The north pole is the northest point of Earth i.e. northern end of the Earth's axis is called North pole. So, statement (1) is true. 45° latitude passes from the middle of the equator and poles. The length of 45° parallel line is 28343.892 km, while the length of the equator is 40090.28 km. and so the 45° parallel is not half of the length of the equator and statement (2) is wrong. Parallelism of the Earth's axis means as Earth revolves around the sun, Earth's axis remain parallel to its previous positions. The situation of Aphelion occurs on 4 July, when the distance between the Sun and Earth is maximum and in the situation of Aphelion the cruising speed of Earth goes slow. Thus, statement (4) is wrong.

The Earth experiences day and night as a result of Earth rotation on its axis. Earth takes around approx. 24 hours to complete one rotation. When a place on Earth faces Sun it has Day time when it faces away from Sun it has night.

The sunrays fall perpendicular at the equator twice in a year (on 21 March and on 23 September). On these dates, the duration of day and night becomes an equal i.e. 12-12 hour, in both of the hemispheres.

The biggest reason for seasonal changes is Earth's axial tilt by 23½ degrees and Earth's revolution around Sun. The variability of the distance of Earth from Sun has also slight importance in regard to seasonal variability.

The biggest reason for seasonal changes is Earth's axial tilt by 23½ degrees and Earth's revolution around Sun. The variability of the distance of Earth from Sun has also slight importance in regard to seasonal variability.

Twice in a year on 21 March and 23rd September, Sun rays fall perpendicular on the Earth at the Equator. From 21" March to 23rd September, the Sun stands between the Equator and Tropic of Cancer. In the same period, summer season occurs in North hemisphere and winter occurs in the South hemisphere. The sunrays fall in askew position in South hemisphere than in North hemisphere, while opposite to it from 23 September to 21 March the Sun stands between Equator and Tropic of Capricorn. In this period, the Sun rays fall in more askew position in North hemisphere than in South hemisphere and summer occurs in South hemisphere and winter occurs in North hemisphere. Due to this process, the temperature of Delhi, situated in North hemisphere; remains higher in summer season as compared to winter season.

If the distance between Sun and Earth is reduced by quarter to present distance, then the size of Earth's orbit in which it revolves around the Sun will be smaller and consequently the duration of the year would be less than 365.25 days.

Due to the reduction in present distance, the speed with which Earth is revolving will increase.

It is true that most satellites are launched in the east direction from Earth because satellites get momentum but it is not true for every satellite launch. Satellite to orbit poles is launched in the direction of north or south.

Any object thrown out of artificial satellite will revolve around like the satellite.