Physics

Olbers' paradox is an apparently simple question, but its resolution suggests that the universe is ...

Started by kamilo84

The gravitational force that the Earth exerts on the Moon is equal and opposite to that which the ...

Started by mia

Most of the planets discovered around other stars have masses comparable to the terrestrial planets ...

Started by vicky

The Doppler technique for planet detection has found Earth-like planets around nearby Sun-like stars ...

Started by codyclark

What are the two possible explanations for not seeing something glowing brightly along every ...

Started by natalie2426

The difference between speed and velocity is that ________. A) velocity is calculated using a ...

Started by captainjonesify

In the cosmic timeline for the universe starting at the Big Bang, we live in the Planck era. ...

Started by magmichele12

Although some photographs show what looks like jets of material near many young stars, we now know ...

Started by jlmhmf

The acceleration of gravity on Earth is approximately 10 m/s2 (more precisely, 9.8 m/s2). If you ...

Started by drink

The Big Bang produced no elements heavier than helium because it was never hot enough for helium to ...

Started by Wadzanai

Once a planet forms in a disk-like nebula around a star, its orbit is fixed and will never change. ...

Started by future617RT

One of the main reasons the Hubble Space Telescope was built and launched was to measure how fast ...

Started by crazycityslicker

In the particle era, particles of matter outnumbered particles of antimatter by about 1 particle in ...

Started by @Brianna17

Wendy measures a recession velocity for two distant galaxies, well outside our Local Group of ...

Started by captainjonesify

Stars with high masses live longer than stars with lower masses. Indicate whether the statement ...

Started by jc611

You have taken a picture of a galaxy 1 billion light years away. That picture shows A) a galaxy ...

Started by biggirl4568

In the greenhouse effect, what is the direct cause of extra heating of the Earth's surface? A) ...

Started by HCHenry

Planetary masses measured using the Doppler technique are lower limits to the possible planetary ...

Started by WhattoUnderstand

Stars spend about 90 of their lifetime on the main sequence. Indicate whether the statement is ...

Started by @Brianna17

Newton's Second Law of Motion tells us that the net force applied to an object equals its ________. ...

Started by jho37

How do scientists estimate how old the universe is? A) They look up the answer in a book. B) ...

Started by skymedlock

The helium fusion process works by fusing two helium nuclei into one beryllium nucleus. Indicate ...

Started by Medesa

Observations of the cosmic background radiation from the COBE satellite revealed tiny variations in ...

Started by skymedlock

Which of these upcoming observations will help test the idea that Mars' atmosphere thinned due to ...

Started by penza

Discoveries force theory revisions: The discovery of hot Jupiters forced scientists to revise the ...

Started by rayancarla1