Astronomy is the branch of science that involves observations and explanations of events that occur beyond Earth and its atmosphere.
100
What are nodes ?
They are the two points at which the Moon's orbital plane intersects Earth's orbital plane.
100
What is a nebula ?
It's a spread-out collection of dust and gases.
100
What is Mercury's daytime temperature ?
427 Celsius.
100
Define "Geocentric".
Earth-centred.
200
How does the photoperiod differ between the two solstices ?
Summer Solstice marks the first day of summer (June 21).Winter Solstice marks the first day of winter.
200
What part of the Sun is visible during a total solar eclipse ?
The corona.
200
What is a nebula made out of ?
It's made out of hydrogen and helium gases and,to a lesser extent,particles of solid matter
200
What is the biggest planet in our universe
Jupiter.
200
Who devised the geocentric model of the universe ?
Claudius Ptolemy.
300
What is the astronomical significance of January 3 and July 4 ?
January 3 is the Perihelion, when the earth is closest to the Sun.July 4 is the aphelion, when the earth is farthest from the Sun.
300
Why do we not have a solar eclipse every new moon ?
Because the earth, moon and sun are not in one line on every new moon night.
300
Define "Terrestrial".
Earth-like.
300
What is Jupiter famous for ?
The Great Red Spot.
300
Who devised the heliocentric model of the universe ?
Nicholas Copernicus.
400
What is unique about the photoperiod at the two different equinoxes ?
The unique thing is that the darkness and light are split exactly (or very close to exactly) in half, giving 12 hours of each daytime.
400
Why is only one side of the Moon visible from the Earth at all times ?
Because the Moon spins once on its axis in exactly the same amount of time that the Moon revolves around the Earth.
400
What happens when comets approach the Sun ?
As it approaches the sun the comets icy surface is blasted off by the suns heat and solar wind thereby forming a tail.
400
What is the distance between Neptune and the Sun ?
4497000000 km.
400
What was Tycho Brahe's discovery in 1572 ?
What was Tycho Brahe's discovery in 1572 ?The Supernova.
500
Name the three main circumpolar constellations.
Ursa major, Ursa minor and Cassiopeia.
500
List the phases of the moon in order.
new moon, waxing crescent, first quarter , waxing gibbous, full moon, waning gibbous, third quarter, waning crescent
500
Explain the Big Splash Theory.
Explain the Big Splash TheoryThe giant impact hypothesis states that the Moon was formed out of the debris left over from a collision between the Earth and a body the size of Mars approximately 4.5 billion years ago.
500
What is an element that is found in all planets ?
Carbon.
500
Explain the Kepler's Law of Planetary Motion.
1.The orbit of every planet is an ellipse with the Sun at one of the two foci.
2.A line joining a planet and the Sun sweeps out equal areas during equal intervals of time.
3.The square of the orbital period of a planet is proportional to the cube of the semi-major axis of its orbit