A) To take pictures of the moon.
B) To magnify objects directly.
C) To gather and focus light.
D) To track satellites.

A) The length of the telescope tube.
B) The magnification power of the eyepiece.
C) The diameter of the objective lens or mirror.
D) The weight of the telescope.

A) Catadioptric telescope.
B) Refracting telescope.
C) Radio telescope.
D) Reflecting telescope.

A) Radio telescope.
B) Reflecting telescope.
C) Refracting telescope.
D) Catadioptric telescope.

A) The width of the lens/mirror.
B) The magnification of the telescope.
C) The distance between the lens/mirror and the focal point.
D) The length of the telescope tube.

A) To filter out unwanted light.
B) To magnify the image formed by the objective.
C) To gather light from distant objects.
D) To focus light into the telescope.

A) Focal length of objective / Focal length of eyepiece.
B) Focal length of objective + Focal length of eyepiece.
C) Focal length of objective * Focal length of eyepiece.
D) Focal length of eyepiece / Focal length of objective.

A) The steadiness of the atmosphere.
B) The observer's eyesight.
C) The brightness of the target object.
D) The clarity of the telescope lens.

A) Excessive artificial light that obscures the night sky.
B) The natural light emitted by stars.
C) The aurora borealis.
D) The reflection of sunlight off the moon.

A) Mirror mount.
B) Equatorial mount.
C) Lens mount.
D) Eyepiece mount.

A) Tracks celestial objects as the Earth rotates.
B) Allows the telescope to move up and down only.
C) Allows the telescope to rotate horizontally only.
D) Keeps the telescope perfectly still.

A) Planets.
B) The Moon's craters.
C) Nebula.
D) Double stars.

A) Planets.
B) Galaxies.
C) Star clusters.
D) Nebula.

A) Calculating the telescope's magnification.
B) Attaching the telescope to the mount.
C) Polishing the telescope lens.
D) Aligning the optical elements of a telescope.

A) To achieve the sharpest possible image.
B) To protect the telescope from dust.
C) To increase the telescope's magnification.
D) To make the telescope easier to carry.

A) Magnifies the image more than the eyepiece.
B) Filters out light pollution.
C) Automatically tracks stars.
D) Helps you locate objects in the sky.

A) Moon filter.
B) Solar filter.
C) Color filter.
D) Light pollution filter.

A) Look directly at the Sun.
B) Look at a bright star.
C) Look at the Moon.
D) Look at a planet.

A) To block out light pollution.
B) To prevent dew from forming on the lens.
C) To protect the telescope from rain.
D) To make the telescope more stable.

A) During twilight.
B) As soon as the sun sets.
C) After the sky is completely dark.
D) During the day.

A) Using a star chart to find faint objects.
B) Observing shooting stars.
C) Observing stars with a binocular.
D) Traveling between different star systems.

A) Astronomical Units (AU).
B) Millimeters or Inches.
C) Parsecs.
D) Light-years.

A) Huygenian eyepiece.
B) Plossl eyepiece.
C) Wide-field eyepiece.
D) Orthoscopic eyepiece.

A) Schmidt-Cassegrain telescope.
B) Maksutov-Cassegrain telescope.
C) Dobsonian telescope.
D) Newtonian telescope.

A) Use a paper towel.
B) Use regular household cleaner.
C) Use your breath and a clean shirt.
D) Use a specialized lens cleaning solution and cloth.

A) The faintest star visible through the telescope.
B) The distance the telescope can see.
C) The maximum magnification of the telescope.
D) The brightest star visible through the telescope.

A) Atmospheric turbulence.
B) Gravitational waves.
C) Electromagnetic radiation.
D) Solar flares.

A) Studying the chemical composition of stars.
B) Measuring the positions of stars.
C) Taking pictures of celestial objects.
D) Drawing pictures of celestial objects.

A) To accurately align an equatorial mount.
B) To find the North Star.
C) To prevent the telescope from drifting.
D) To measure the speed of stars.

A) Moon filter.
B) Solar filter.
C) Light pollution filter.
D) Hydrogen-alpha filter.