Question: The day on which the Sun’s direct rays cross the celestial equator is called:
Answer: On the equinox, the day on which the Sun’s path crosses the celestial equator, night and day are of equal length.
Question: Who invented the telescope?
Answer: Hans Lippershey (c. 1570–c. 1619), a spectacle maker in the Netherlands, is traditionally credited with the invention of the telescope.
Question: Which of these objects is the farthest from the Sun?
Answer: 90377 Sedna (or, simply, Sedna) is 13 billion km (8.1 billion miles) from the Sun.
Question: What term describes the alignment of three celestial bodies?
Answer: When three celestial bodies appear to be in a straight line, as sometimes happens, hey are said to be in syzygy.
Question: What is the smallest planet in the solar system by mass?
Answer: Mercury, the innermost planet of the solar system, is the smallest by mass (and size).
Question: What is the visible part of the Sun called?
Answer: The outer region of the Sun that is normally visible from the Earth is called the photosphere, which means “sphere of light.”
Question: What makes a planet a dwarf planet?
Answer: In 2006, Pluto, Eris, and Ceres were classified as dwarf planets because of their size and shape.
Question: How many times larger is the radius of the Sun than that of the Earth?
Answer: The radius of the Sun is 109 times that of the Earth.
Question: What two motions do all planets have?
Answer: All planets have two types of motion, known as orbit and spin.
Question: Approximately how many miles are there in a light-year?
Answer: A light-year is the distance light travels in a vacuum in a year—about 5.9 trillion miles, or 9.5 trillion kilometers.
Question: Which is the name of a radio source that is very far from Earth?
Answer: A quasar is an astronomical object of very high luminosity found in the centres of some galaxies. Its name is derived from the manner in which these objects were discovered: via radio surveys of the sky. The name quasar means “quasi-stellar radio source.”
Question: What is the nucleus of a comet made of?
Answer: The nuclei of comets are small solid bodies composed of roughly equal parts of volatile ices, fine silicate dust, and organic materials. 
Question: When did the Space Age begin?
Answer: The Space Age began on October 4, 1957, when the Soviet Union launched Sputnik 1, the first artificial Earth satellite.
View of the Andromeda Galaxy (Messier 31, M31).

Astronomy and Space Quiz

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