The first planets ever discovered outside our Solar System were
A: Making their host stars wobble around detectably in the sky
B: Transiting their host stars once every day
C: Brightening background stars via microlensing
D: In orbit around a millisecond pulsar, not a normal star
E: Making their host stars wobble around such that the velocity could be detected by the Doppler Effect
Answer: D: In orbit around a millisecond pulsar, not a normal star
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The _________________ hypothesis includes mergers with smaller galaxies and infalling gas to the standard formation of the Milky Way galaxy
Fill in the blank(s) with correct word
Organisms designated as producers usually obtain their energy from:
a. other producers b. dead consumers c. decomposers d. the environment e. themselves
The energy required to move an electron in a hydrogen atom from energy level 1 to energy level 2 is:
A) 10.2 eV. B) 12.1 eV. C) 12.75 eV. D) 13.1 eV. E) 13.6 eV.
In 1998 came the discovery of ________, which seems to overwhelm even gravity and all the dark matter in the final fate of the cosmos
Fill in the blank(s) with correct word