Long Test: Concept 1 to 6

It is an early stage in the formation of a star resulting from the gravitational collapse of gases.

• Supernova

• Big Bang Theory

•  Protostar

• Nebular Theory

Answer explanation

A supernova is the biggest explosion that humans have ever seen. Each blast is the extremely bright, super-powerful explosion of a star.

 Who discovered the “Redshift” as evidence for an expanding universe?

• Georges Lemaitre

• Edwin Hubble

• Alexander Friedmann

• Arno Allen Penzias

Answer explanation

A redshift reveals how an object in space (star/planet/galaxy) is moving compared to us. It lets astronomers measure a distance for the most distant (and therefore oldest) objects in our universe.

What is the most accepted theory about the origin of the universe?

• Steady-State Model

• Non-Scientific Thought

• Oscillating Universe

• Big Bang Theory

Answer explanation

At its simplest, it says the universe as we know it started with an infinitely hot, infinitely dense singularity, then inflated — first at unimaginable speed, and then at a more measurable rate — over the next 13.8 billion years to the cosmos that we know today.

It has a faint glow of light that fills the universe as a remnant from an early stage of the Universe in Big Bang cosmology.

• Ultraviolet light

• Cosmic Microwave Background

• Radio waves

• Cosmic Background Microwave

Answer explanation

The cosmic microwave background (CMB) is thought to be leftover radiation from the Big Bang, or the time when the universe began. As the theory goes, when the universe was born it underwent a rapid inflation and expansion. ... This means its radiation is most visible in the microwave part of the electromagnetic spectrum

What kind of matter in the universe has gravity but does not emit light?

• Cold Dark Matter

• Baryonic Matter

• Dark Energy

• Redshift

Answer explanation

Although it cannot be detected by current instrumentation, cosmologists believe dark matter is comprised of cold slow moving particles that do not emit electromagnetic radiation or scatter light, thus they also appear dark.

What is the estimated age of the Solar system?

• 13.8 billion years 


• 4.3 billion years

• 4.6 billion years

• 4.5 billion years

Answer explanation

Our solar system consists of our star, the Sun, and everything bound to it by gravity – the planets Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune; dwarf planets such as Pluto; dozens of moons; and millions of asteroids, comets, and meteoroids.

Where is the Solar system located?

• Andromeda

• Black Eye Galaxy

• Cartwheel Galaxy

• Milky Way

Answer explanation

The Milky Way is the Galaxy in which we live. It is a spiral-shaped galaxy that contains several hundred billion stars, including our Sun. It is about 100,000 light-years across and about 10,000 light-years thick

How most planets rotate?

• Retrograde

• Prograde

• Doesn’t rotate

• None of the above

What will happen to the period of revolution of the planets if the distance increasing from the sun?

• The periods of revolution of the planets will decrease

• The periods of revolution of the planets will increase

• The periods of revolution of the planets will remain constant

• None of the above

What are the characteristics of inner terrestrial planets?

• It is made of materials with high melting points such as silicates, iron, and nickel.

• They rotate faster, have a thick atmosphere, low densities.

• Dominance of gases and have a larger size.

• None of the above 


Answer explanation

The planets Mercury, Venus, Earth, and Mars, are called terrestrial because they have a compact, rocky surface like Earth's terra firma. The terrestrial planets are the four innermost planets in the solar system.