Top 10 space factsSpace quiz
Is the speed of light photons always constant?
A speed of light is always constant. The speed at which light propagates through transparent materials, such as glass or air, is less than c. However, this "slowing of the light" is only due to the fact of photos being absorbed and re-emitted after a slight delay between atoms. When a photon is emitted, it's speed is always c. In exotic materials like Bose–Einstein condensates near absolute zero, the effective speed of light may be only a few metres per second.
How long did it take Apollo 11 flight to reach the Moon?
3 days. It took 1 minute of flight to reach Mach 1 and 12 minutes to enter Earth's orbit. After one and a half orbits, the third-stage engine pushed the spacecraft onto its three-day long travel to the Moon.
What are the most luminous objects in the universe?
Quasars. A quasar is an extremely energetic source of radiation powered by accretion disc around galaxy's central supermassive black hole. Quasars were much more common in the early universe, as all known quasars are extremely distant.
On which planet, except the Earth, is the greenhouse effect observed?
Venus. If a planet's atmosphere contains radiatively active gases, they will radiate energy in all directions. Part of this radiation is directed towards the surface, warming it. The greenhouse effect on Venus is particularly large because its dense atmosphere consists mainly of carbon dioxide.
What astronomical object emerges sometimes from supernova instead of a black hole?
Magnetar. A magnetar is a type of neutron star with an extremely powerful magnetic field. The magnetic field decay powers the emission of high-energy electromagnetic radiation, particularly X-rays and gamma rays. As of March 2016, only 23 magnetars are known, with six more candidates awaiting confirmation.
What is the name of the hypothetical last stage of the evolution of Sun-sized stars?
Black dwarf. A black dwarf is a theoretical stellar remnant, specifically a white dwarf that has cooled sufficiently that it no longer emits significant heat or light
What was the object that collided with Earth, according to the giant-impact hypothesis?
A planet. According to the giant impact hypothesis Earth once collided with a planet of Mars size usually referred to as Theia, a titaness of Greek mythology, mother of Selene - Moon goddess, which is to reflect the believe the collision was an origin of the Moon.
The first American astronauts insisted on the installation of an extra element to their spacecraft. What was it?
Window. The Early prototype Mercury spacecraft had only two portholes, but the Mercury astronauts demanded a larger window to be installed, not only for the view but also for the orientation. The latter proved invaluable on their last mission, when instrument failure required visual orientation.