What does the word 'phases' mean in astronomy?

What are groups of stars that make pictures called and how is this word spelt?

What is it called when you measure a day's time by the Sun and when you measure a day's time by the stars?

What two words mean 'an imaginary object of which the observer is the centre and on which all celestial objects are considered to lie'.

What two angles are used to measure where a star is, no matter where you are?

What is the system called for working out where a star is in the sky and what is the reference point called?

What is it called when the planets slow down and appear to go in reverse to their usual movements?

What modern-day explanation is there for retrograde motion?

What two kinds of eclipses are there?

What is almost exactly the same for the Moon and the Sun?

What two kinds of shadow are there for the Moon and the Sun?

Why don't we see an eclipse twice a month or so?

What is the Sun's hot atmosphere called?

What does a telescope do?

What differences are there between a real image and a virtual one?

How does a ray diagram explain how a real image is made in a pinhole camera?

What is it called when light bends as it passes through a material and what kind of lens does this in telescopes?

What is the horizontal line that passes through a converging lens called?

What is the point at which all the light rays meet called?

What is the distance between the center of the converging lens and the focus called?

What equation shows the power of a lens, and what is this measured in?

Why does light refract moving through a lens?

In a telescope, there are two lenses. Which is near your eye and which is on the other end, and what job does each do?

What is the other way of saying an object appears upside down?

What is it called when a lens has a large diameter and why does this matter?

If a telescope makes the Moon seem 50x bigger, what does it have?

What is an object made up of many points of light called?

What is the equation for magnification?

What is the rainbow of light that comes from a prism called and what is the splitting of light called?

How are spectrometers used in astronomy?

Early telescopes were refractors, what kind of telescope are modern day telescopes and how do they work?

What must a mirror be to focus light?

What is the law of reflection?

What is used in a reflecting telescope so you don't have to sit inside the telescope?

What is needed in a telescope to get a clear image?

What happens when waves hit the edge of a barrier or pass through a gap in a barrier and what is this called?

How does diffraction connect to telescopes?

What electromagnetic radiation is absorbed by the atmosphere and what is refracted?

What is the cause of scintillation?

Why does street lights in a nearby town bother astronomers and what is this effect called?

How is a parallax angle worked out?

What are parallax angles usually measured in?

How many degrees is a second of arc?

What is the equation for working out a parsec?

What is the power output of a star called?

What are the stars that don't emit light at a steady rate called?

How does a Cepheid vary and what is changing?

What is a million parsecs called?

How are Cepheid variables used to measure distance?

What is 'a cluster of hundreds of thousands of old stars' called?

What are the clouds sometimes seen by astronomers called?

What can supernova be used to measure?

There's a linear relationship between galaxies in redshift. The further away the star, the...

How is speed of recession worked out?

What are the huge lumps that sometimes explode out of the Sun called?

What two signs are there of a hot star on a graph with the electromagnetic spectrum and intensity of radiation?

What is the definition of an emission spectrum?

What is the source of sunlight called?

What does an absorption spectrum show?

What is the energy in a photon equal to?

Why do you get absorption lines?

What makes two nuclei combine to make a new nucleus and what holds them back from doing this?

When a proton decays to a neutron, what two things are emitted?

What is the line running through the middle of the H-R diagram called?

What is space filled with?

What relation is there between temperature and density in ISM?

What four measurable quantities are there of a gas?

For a fixed mass of gas at a constant temperature, what equation explains the relationship between pressure and volume?

What model can be used to explain why pressure increases when volume decreases?

What happens to volume and pressure when temperature decreases?

What scale has absolute zero as it's actual zero?

What is a star called before it actually becomes a fully fledged fusing-star?

Why does a supernova begin?

In supernova, what happens in the core?

What is a neutron star?

What happens to a star like the Sun when it stops being a red giant?

What are planets orbiting other stars called?

What organisation actively looks for alien life?