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WorksheetsHW 10: Deep Time
Total questions: 19
Worksheet time: 10mins
Eventually the Universe's star creation will slow and more and more existing stars will begin dying off. This will cause...
Galaxies change their color to appear more blue
Galaxies change their color to appear more red
Galaxies change their color to appear more green
Eventually, galaxies gradually become more dim. What causes this dimming?
The higher mass, hotter blue stars burn through their fuel and die off, leaving behind only redder stars which emit less light.
The bright red stars in the galactic core will fade and leave behind less energetic blue stars.
The stars all age at the same rate, and so they will naturally dim all together in the same way as they exhaust their nuclear fuel.
Which of the following will NOT still be around after galaxies dim?
Supergiant Blue stars
Black Holes
Neutron Stars
White Dwarfs
Brown Dwarfs
What name is given to the era/epoch of time immediately following the Stelliferous Era?
Deep Time
The Dark Ages
The Big Crunch
The Degenerate Era
What will happen to binary star systems (2 stars orbiting each other) over long stretches of time?
Their orbits expand and the stars eventually lose contact with each other.
The individual stars become brighter and brighter.
Their orbits decay and they eventually become a single stellar object.
What mechanism would lead to the creation of new stars even in the Degenerate Era?
Brown Dwarf mergers
Black Hole mergers
White Dwarf mergers
Neutron Star mergers
What's the eventual fate of out galaxy long into the Degenerate Era?
It spreads out until eventually all gravitational attraction is to weak to hold it together.
It merges with other local galaxies into a single elliptical galaxy.
Its stars brighten and eventually become White Dwarfs.
What's the eventual fate of all stars during the Degenerate Era?
The atoms are squished and the result is a Neutron Star.
The atoms they are made from merge into Super Atoms.
The protons they are made from eventually decay and release small amounts of energy.
Which of the following is the earliest?
The Stelliferous Era
The Primordial Era
The Black Hole Era
The Degenerate Era
Which of the following comes after the Stelliferous Era?
The Stelliferous Era
The Primordial Era
The Black Hole Era
The Degenerate Era
Which of the following comes after the Degenerate Era?
The Stelliferous Era
The Primordial Era
The Black Hole Era
The Degenerate Era
Through what mechanism will Black Holes evaporate?
The light they emit carries energy away from the Black Hole until is disappears.
Hawking Radiation will carry away tiny amounts of energy until there is no energy left.
The Black Hole will wobble violently and eventually throw all of its energy outwards in a blast.
Which of the following describes Hawking Radiation?
Deep within the Black Hole atoms tunnel their way through worm holes and are emitted in bursts elsewhere in the Universe as radiation.
The X-rays flung outwards along the axis of the Black Hole's rotation is called Hawking Radiation.
Near the event horizon space itself will steal a bit of energy and particles will pop into existence in a pair, one of which is outside the horizon and escapes as radiation.
Which is FALSE about Black Hole evaporation?
The largest black holes can take as much as
1092 years to evaporate.The mechanism for their evaporation is known as Hawking Radiation.
The X-ray radiation quickly evaporates Black Holes.
Larger mass Black Holes evaporate faster than lower mass Black Holes.
At what point does the Universe enter the Dark Era?
When the Black Holes have evaporated and all that is left are subatomic particles and photons (light) flying around.
When all photons (light) no longer exists.
When the Universe is dominated by Black Holes.
What's the name for the concept describing a Universe where all energy and matter are so spread out that every individual element is alone within its Cosmic Horizon?
The Big Bang
The Big Crunch
The Big Rip
What's the name for the concept describing a Universe ending up with all energy and matter are condensed into single point in space?
The Big Bang
The Big Crunch
The Big Rip
What mechanism would be driving the Big Rip, if it were to occur?
Hawking Radiation
Gravity
The Strong Nuclear Forces
Dark Energy
What mechanism would be driving the Big Crunch, if it were to occur?
Hawking Radiation
Gravity
Dark Matter
Dark Energy
