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

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

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

A) Radio telescope.
B) Catadioptric telescope.
C) Refracting telescope.
D) Reflecting 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 brightness of the target object.
C) The clarity of the telescope lens.
D) The observer's eyesight.

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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