In this telescope, what is the main role of part A?

Which optical component is labeled B?

One night, a ground-based optical telescope records blurred but visible stars. The next night, starlight is blocked. Which pair of atmospheric conditions best explains this sequence?

Hubble operates far above the ground. Which source of image blurring does this placement avoid?

A spacecraft sends television signals between distant ground stations. Which job is it performing?

PAGASA follows developing storm clouds using images collected from orbit. What is the main purpose of these observations?

A fisher in Palawan uses GPS to determine the boat's location. Which type of spacecraft supplies the signals used for this service?

Which task is best suited to a space probe?

What is the main scientific role of the International Space Station?

Why do astronauts and loose objects float together aboard the ISS?

How are ISS operations organized?

Which distance is used as the near-Earth-object cutoff for an asteroid's closest approach to the Sun? One AU is Earth's average distance from the Sun.

Why does asteroid deflection generally benefit from many years of advance warning?

Dust from a very large asteroid impact reduces sunlight reaching Earth's surface. Which combination of effects is most likely soon afterward?

Which pair of observations best studies cool dust and gas heated to millions of degrees, respectively?

In which year was PhilSA established?

Which responsibility belongs to PhilSA?

The Diwata microsatellites were developed through collaboration with institutions from which country?

Satellite maps show declining crop cover on a farm. Why should farmers also inspect crops and soil before choosing a treatment?

After a typhoon in Leyte, which information could Diwata's Earth-observation images most directly provide?