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

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

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

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

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

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

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

A) The observer's eyesight.
B) The steadiness of the atmosphere.
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) Equatorial mount.
B) Eyepiece mount.
C) Lens mount.
D) Mirror mount.

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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