Quiz
Brown Dwarfs
3 years ago by
craniumfire
Save
Edit
Live modes
Start a live quiz
Asynchronous learning
Assign homework
20 questions
Preview
Show answers
  • Question 1
    30 seconds
    Report an issue
    Q. Energy is generated in the cores of stars by fusing ___
    answer choices
    hydrogen into helium
    helium into hydrogen
    hydrogen into lithium
    helium into lithium
  • Question 2
    30 seconds
    Report an issue
    Q. The expansion created by the heat of fusion is usually balanced by a star's gravity, creating ___
    answer choices
    an imbalance
    a conversion
    an inversion
    an equilibrium
  • Question 3
    30 seconds
    Report an issue
    Q. In gas giants, like Jupiter, the force of gravity is balanced by ___
    answer choices
    the heat of fusion
    simple gas pressure
    tidal forces
    centripetal forces
  • Question 4
    30 seconds
    Report an issue
    Q. The minimum mass for fusing hydrogen, and becoming a star, is roughly ___
    answer choices
    twice the mass of Jupiter
    7 times the mass of Jupiter
    75 times the mass of Jupiter
    half the mass of the Sun
  • Question 5
    30 seconds
    Report an issue
    Q. Stars form from collapsing gas clouds,  just like the Sun did ___ years ago
    answer choices
    4.6 million
    14.6 million
    4.6 billion
    14.6 billion
  • Question 6
    30 seconds
    Report an issue
    Q. Objects with a mass range between the heaviest planets and the lightest stars became known as ___
    answer choices
    red gnomes
    brown gnomes
    red dwarfs
    brown dwarfs
  • Question 7
    30 seconds
    Report an issue
    Q. Astronomers classify stars, using letters, based on their ___
    answer choices
    temperature
    size
    luminosity
    composition
  • Question 8
    30 seconds
    Report an issue
    Q. A new cooler class of star, discovered in 1988, was given the letter ___
    answer choices
    'O'
    'L'
    'F'
    'M'
  • Question 9
    30 seconds
    Report an issue
    Q. Which element is found in low-mass brown-dwarfs, but not in regular stars?
    answer choices
    sodium
    magnesium
    lithium
    beryllium
  • Question 10
    30 seconds
    Report an issue
    Q. The very first true brown dwarf was found in 1995 among a cluster of stars called ___
    answer choices
    the Pleiades
    the nine sisters
    Hyades
    the Beehive Cluster
  • Question 11
    30 seconds
    Report an issue
    Q. Which delicate molecule was found in the spectrum of Gliese 229B, the first T dwarf?
    answer choices
    carbon monoxide
    carbon dioxide
    methane
    ammonia
  • Question 12
    30 seconds
    Report an issue
    Q. Gliese 229B, the first T dwarf, was one of the first targets of a new camera on ___
    answer choices
    The Palomar Hale telescope
    The Spitzer Space Telescope
    The James Webb Space Telescope
    The Hubble Space Telescope
  • Question 13
    30 seconds
    Report an issue
    Q. Hundreds of brown dwarfs were discovered by NASA's orbiting observatory called the "wide-field ___"
    answer choices
    analysis survey plotter
    infrared perusal explorer
    infrared survey explorer
    infrared survey performer
  • Question 14
    30 seconds
    Report an issue
    Q. Warm brown dwarfs, that have molecules like methane and water in their atmosphere, probably look ___
    answer choices
    lilac
    purple
    red
    magenta
  • Question 15
    30 seconds
    Report an issue
    Q. In WISE images, where astronomers map each infrared color to one our eyes can see, brown dwarfs look ___
    answer choices
    green
    blue
    white
    red
  • Question 16
    30 seconds
    Report an issue
    Q. As brown dwarfs get more massive, they ___
    answer choices
    get smaller and denser
    get denser, but not bigger
    get larger and denser
    get bigger, but not denser
  • Question 17
    30 seconds
    Report an issue
    Q. Brown dwarfs, more than about 13 times Jupiter's mass,  can fuse both lithium and ___
    answer choices
    deuterium
    tritium
    beryllium
    boron
  • Question 18
    30 seconds
    Report an issue
    Q. Deuterium is an atom that's very similar to hydrogen except it has ___
    answer choices
    a proton and a neutron in its nucleus
    two neutrons in its nucleus
    two protons in its nucleus
    two orbiting electrons
  • Question 19
    30 seconds
    Report an issue
    Q. Brown dwarfs are not considered true stars because they don't fuse ___
    answer choices
    hydrogen
    silicon
    lithium
    beryllium
  • Question 20
    30 seconds
    Report an issue
    Q. In 2013, astronomers found a binary pair of brown dwarfs, called Luhman 16,  a distance of only ___
    answer choices
    0.65 light years away
    6.5 light years away
    65 light years away
    650 light years away
Report an issue
Why show ads?
Report Ad
Lessonsnew
Enter Code