universe & solar system section 13 Practice Questions Answers Test with Solutions & More Shortcuts

Answer: (d)

The albedo of an object determines its visual brightness when viewed with reflected light. Albedo is the fraction of solar energy (shortwave radiation) reflected from the Earth back into space.

It is a measure of the reflectivity of the earth’s surface.

Answer: (c)

Earth is the Blue Planet because of the vast encompass of oceans on its surface. From space the oceans combined with the atmosphere make the planet look blue. 

The abundance of water on Earth's surface is a unique feature that distinguishes the 'Blue Planet' from others in the Solar System.

Answer: (d)

• Uranus is a planet.
• Moon is a satellite.
• Halley is a comet.
• Mariner is an artificial satellite.

The Mariner program was a program conducted by the American space agency NASA in conjunction with Jet Propulsion Laboratory (JPL) that launched a series of robotic interplanetary probes designed to investigate Mars, Venus and Mercury from 1962 to 1973.

The program included a number of firsts, including the first planetary flyby, the first pictures from another planet, the first planetary orbiter, and the first gravity assist manoeuvre.

Answer: (a)

The color of the star is an indication of its temperature. The glowing is caused by something called Black-Body radiation, which has to do with the heat energy trying to radiate away in more and more energetic wavelengths.

Red stars are relatively cool at only a few thousand degrees Celsius, white stars are hot at about ten thousand degrees, and blue stars are the hottest.

Answer: (d)

Ganymede is the largest satellite in the solar system. Ganymede is a satellite of Jupiter and the largest moon in the Solar System.

It is the seventh moon and third Galilean satellite outward from Jupiter. Completing an orbit in roughly seven days, Ganymede participates in a 1:2:4 orbital resonance with the moons Europa and Io, respectively.

It has a diameter of 5,268 km (3,273 mi), 8% larger than that of the planet Mercury, but has only 45% of the latter’s mass.